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Finding the Fourth Proportional to 72,905.20, 109,422.60 and 62,407.60

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Solution

The fourth proportional to 72,905.20, 109,422.60 and 62,407.60 is: 93,666.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,905.20 : 109,422.60 = 62,407.60 : x
  2. Step 2: Convert to fraction form
    72,905.20/109,422.60 = 62,407.60/x
  3. Step 3: Cross multiply
    72,905.20x = 109,422.60 × 62,407.60
  4. Step 4: Simplify right side
    72,905.20x = 6,828,801,851.76
  5. Step 5: Solve for x
    x = 6,828,801,851.76/72,905.20
  6. Step 6: Final answer
    x = 93,666.87

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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.