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Finding the Fourth Proportional to 72,400.78, 99,915.78 and 40,568.50

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Solution

The fourth proportional to 72,400.78, 99,915.78 and 40,568.50 is: 55,986.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,400.78 : 99,915.78 = 40,568.50 : x
  2. Step 2: Convert to fraction form
    72,400.78/99,915.78 = 40,568.50/x
  3. Step 3: Cross multiply
    72,400.78x = 99,915.78 × 40,568.50
  4. Step 4: Simplify right side
    72,400.78x = 4,053,433,320.93
  5. Step 5: Solve for x
    x = 4,053,433,320.93/72,400.78
  6. Step 6: Final answer
    x = 55,986.04

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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.