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Finding the Fourth Proportional to 72,915.52, 109,382.40 and 28,536.54

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Solution

The fourth proportional to 72,915.52, 109,382.40 and 28,536.54 is: 42,808.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,915.52 : 109,382.40 = 28,536.54 : x
  2. Step 2: Convert to fraction form
    72,915.52/109,382.40 = 28,536.54/x
  3. Step 3: Cross multiply
    72,915.52x = 109,382.40 × 28,536.54
  4. Step 4: Simplify right side
    72,915.52x = 3,121,395,232.90
  5. Step 5: Solve for x
    x = 3,121,395,232.90/72,915.52
  6. Step 6: Final answer
    x = 42,808.38

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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.