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Finding the Fourth Proportional to 91,979.80, 137,969.70 and 63,986.20

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Solution

The fourth proportional to 91,979.80, 137,969.70 and 63,986.20 is: 95,979.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,979.80 : 137,969.70 = 63,986.20 : x
  2. Step 2: Convert to fraction form
    91,979.80/137,969.70 = 63,986.20/x
  3. Step 3: Cross multiply
    91,979.80x = 137,969.70 × 63,986.20
  4. Step 4: Simplify right side
    91,979.80x = 8,828,156,818.14
  5. Step 5: Solve for x
    x = 8,828,156,818.14/91,979.80
  6. Step 6: Final answer
    x = 95,979.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.