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Finding the Fourth Proportional to 91,239.60, 136,872.42 and 28,065

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Solution

The fourth proportional to 91,239.60, 136,872.42 and 28,065 is: 42,101.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,239.60 : 136,872.42 = 28,065 : x
  2. Step 2: Convert to fraction form
    91,239.60/136,872.42 = 28,065/x
  3. Step 3: Cross multiply
    91,239.60x = 136,872.42 × 28,065
  4. Step 4: Simplify right side
    91,239.60x = 3,841,324,467.30
  5. Step 5: Solve for x
    x = 3,841,324,467.30/91,239.60
  6. Step 6: Final answer
    x = 42,101.50

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1.5x scale

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.