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Finding the Fourth Proportional to 91,285.95, 136,928.93 and 84,287.55

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Solution

The fourth proportional to 91,285.95, 136,928.93 and 84,287.55 is: 126,431.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,285.95 : 136,928.93 = 84,287.55 : x
  2. Step 2: Convert to fraction form
    91,285.95/136,928.93 = 84,287.55/x
  3. Step 3: Cross multiply
    91,285.95x = 136,928.93 × 84,287.55
  4. Step 4: Simplify right side
    91,285.95x = 11,541,403,612.38
  5. Step 5: Solve for x
    x = 11,541,403,612.38/91,285.95
  6. Step 6: Final answer
    x = 126,431.33

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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.