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Finding the Fourth Proportional to 91,405.20, 137,107.80 and 42,253.20

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Solution

The fourth proportional to 91,405.20, 137,107.80 and 42,253.20 is: 63,379.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,405.20 : 137,107.80 = 42,253.20 : x
  2. Step 2: Convert to fraction form
    91,405.20/137,107.80 = 42,253.20/x
  3. Step 3: Cross multiply
    91,405.20x = 137,107.80 × 42,253.20
  4. Step 4: Simplify right side
    91,405.20x = 5,793,243,294.96
  5. Step 5: Solve for x
    x = 5,793,243,294.96/91,405.20
  6. Step 6: Final answer
    x = 63,379.80

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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.