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Finding the Fourth Proportional to 99,412.88, 137,193.56 and 56,979.60

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Solution

The fourth proportional to 99,412.88, 137,193.56 and 56,979.60 is: 78,634.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,412.88 : 137,193.56 = 56,979.60 : x
  2. Step 2: Convert to fraction form
    99,412.88/137,193.56 = 56,979.60/x
  3. Step 3: Cross multiply
    99,412.88x = 137,193.56 × 56,979.60
  4. Step 4: Simplify right side
    99,412.88x = 7,817,234,171.38
  5. Step 5: Solve for x
    x = 7,817,234,171.38/99,412.88
  6. Step 6: Final answer
    x = 78,634.02

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1.5x scale

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.