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Finding the Fourth Proportional to 72,920.40, 109,348.20 and 28,532.40

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Solution

The fourth proportional to 72,920.40, 109,348.20 and 28,532.40 is: 42,785.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,920.40 : 109,348.20 = 28,532.40 : x
  2. Step 2: Convert to fraction form
    72,920.40/109,348.20 = 28,532.40/x
  3. Step 3: Cross multiply
    72,920.40x = 109,348.20 × 28,532.40
  4. Step 4: Simplify right side
    72,920.40x = 3,119,966,581.68
  5. Step 5: Solve for x
    x = 3,119,966,581.68/72,920.40
  6. Step 6: Final answer
    x = 42,785.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.