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Finding the Fourth Proportional to 18,363.69, 25,341.80 and 9,980.19

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Solution

The fourth proportional to 18,363.69, 25,341.80 and 9,980.19 is: 13,772.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,363.69 : 25,341.80 = 9,980.19 : x
  2. Step 2: Convert to fraction form
    18,363.69/25,341.80 = 9,980.19/x
  3. Step 3: Cross multiply
    18,363.69x = 25,341.80 × 9,980.19
  4. Step 4: Simplify right side
    18,363.69x = 252,915,929.04
  5. Step 5: Solve for x
    x = 252,915,929.04/18,363.69
  6. Step 6: Final answer
    x = 13,772.61

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.