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Finding the Fourth Proportional to 100,651.40, 138,929.84 and 64,841.28

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Solution

The fourth proportional to 100,651.40, 138,929.84 and 64,841.28 is: 89,500.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,651.40 : 138,929.84 = 64,841.28 : x
  2. Step 2: Convert to fraction form
    100,651.40/138,929.84 = 64,841.28/x
  3. Step 3: Cross multiply
    100,651.40x = 138,929.84 × 64,841.28
  4. Step 4: Simplify right side
    100,651.40x = 9,008,388,655.80
  5. Step 5: Solve for x
    x = 9,008,388,655.80/100,651.40
  6. Step 6: Final answer
    x = 89,500.88

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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.