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Finding the Fourth Proportional to 99,905.95, 137,909.65 and 61,680.95

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Solution

The fourth proportional to 99,905.95, 137,909.65 and 61,680.95 is: 85,144.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,905.95 : 137,909.65 = 61,680.95 : x
  2. Step 2: Convert to fraction form
    99,905.95/137,909.65 = 61,680.95/x
  3. Step 3: Cross multiply
    99,905.95x = 137,909.65 × 61,680.95
  4. Step 4: Simplify right side
    99,905.95x = 8,506,398,226.17
  5. Step 5: Solve for x
    x = 8,506,398,226.17/99,905.95
  6. Step 6: Final answer
    x = 85,144.06

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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.