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Finding the Fourth Proportional to 91,377.72, 136,687.50 and 85,779

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Solution

The fourth proportional to 91,377.72, 136,687.50 and 85,779 is: 128,312.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,377.72 : 136,687.50 = 85,779 : x
  2. Step 2: Convert to fraction form
    91,377.72/136,687.50 = 85,779/x
  3. Step 3: Cross multiply
    91,377.72x = 136,687.50 × 85,779
  4. Step 4: Simplify right side
    91,377.72x = 11,724,917,062.50
  5. Step 5: Solve for x
    x = 11,724,917,062.50/91,377.72
  6. Step 6: Final answer
    x = 128,312.65

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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.