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Finding the Fourth Proportional to 91,409.20, 137,113.80 and 42,257.20

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Solution

The fourth proportional to 91,409.20, 137,113.80 and 42,257.20 is: 63,385.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,409.20 : 137,113.80 = 42,257.20 : x
  2. Step 2: Convert to fraction form
    91,409.20/137,113.80 = 42,257.20/x
  3. Step 3: Cross multiply
    91,409.20x = 137,113.80 × 42,257.20
  4. Step 4: Simplify right side
    91,409.20x = 5,794,045,269.36
  5. Step 5: Solve for x
    x = 5,794,045,269.36/91,409.20
  6. Step 6: Final answer
    x = 63,385.80

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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.