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Finding the Fourth Proportional to 72,781.28, 99,901.56 and 64,645.64

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Solution

The fourth proportional to 72,781.28, 99,901.56 and 64,645.64 is: 88,734.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,781.28 : 99,901.56 = 64,645.64 : x
  2. Step 2: Convert to fraction form
    72,781.28/99,901.56 = 64,645.64/x
  3. Step 3: Cross multiply
    72,781.28x = 99,901.56 × 64,645.64
  4. Step 4: Simplify right side
    72,781.28x = 6,458,200,283.20
  5. Step 5: Solve for x
    x = 6,458,200,283.20/72,781.28
  6. Step 6: Final answer
    x = 88,734.36

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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.