Home / 13,355.38-18,430.34-7,980.27

Finding the Fourth Proportional to 13,355.38, 18,430.34 and 7,980.27

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Solution

The fourth proportional to 13,355.38, 18,430.34 and 7,980.27 is: 11,012.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,355.38 : 18,430.34 = 7,980.27 : x
  2. Step 2: Convert to fraction form
    13,355.38/18,430.34 = 7,980.27/x
  3. Step 3: Cross multiply
    13,355.38x = 18,430.34 × 7,980.27
  4. Step 4: Simplify right side
    13,355.38x = 147,079,084.05
  5. Step 5: Solve for x
    x = 147,079,084.05/13,355.38
  6. Step 6: Final answer
    x = 11,012.72

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Half scale
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Double scale
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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.