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Finding the Fourth Proportional to 91,285.70, 136,928.55 and 84,287.30

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Solution

The fourth proportional to 91,285.70, 136,928.55 and 84,287.30 is: 126,430.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,285.70 : 136,928.55 = 84,287.30 : x
  2. Step 2: Convert to fraction form
    91,285.70/136,928.55 = 84,287.30/x
  3. Step 3: Cross multiply
    91,285.70x = 136,928.55 × 84,287.30
  4. Step 4: Simplify right side
    91,285.70x = 11,541,337,772.42
  5. Step 5: Solve for x
    x = 11,541,337,772.42/91,285.70
  6. Step 6: Final answer
    x = 126,430.95

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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.