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Finding the Fourth Proportional to 99,985.28, 138,093.12 and 68,098.88

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Solution

The fourth proportional to 99,985.28, 138,093.12 and 68,098.88 is: 94,053.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,985.28 : 138,093.12 = 68,098.88 : x
  2. Step 2: Convert to fraction form
    99,985.28/138,093.12 = 68,098.88/x
  3. Step 3: Cross multiply
    99,985.28x = 138,093.12 × 68,098.88
  4. Step 4: Simplify right side
    99,985.28x = 9,403,986,807.71
  5. Step 5: Solve for x
    x = 9,403,986,807.71/99,985.28
  6. Step 6: Final answer
    x = 94,053.71

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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.