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Finding the Fourth Proportional to 18,919.86, 25,920.34 and 18,210.45

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Solution

The fourth proportional to 18,919.86, 25,920.34 and 18,210.45 is: 24,948.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.86 : 25,920.34 = 18,210.45 : x
  2. Step 2: Convert to fraction form
    18,919.86/25,920.34 = 18,210.45/x
  3. Step 3: Cross multiply
    18,919.86x = 25,920.34 × 18,210.45
  4. Step 4: Simplify right side
    18,919.86x = 472,021,107.23
  5. Step 5: Solve for x
    x = 472,021,107.23/18,919.86
  6. Step 6: Final answer
    x = 24,948.44

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.