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Finding the Fourth Proportional to 91,690.72, 137,508.05 and 63,409.50

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Solution

The fourth proportional to 91,690.72, 137,508.05 and 63,409.50 is: 95,094.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,690.72 : 137,508.05 = 63,409.50 : x
  2. Step 2: Convert to fraction form
    91,690.72/137,508.05 = 63,409.50/x
  3. Step 3: Cross multiply
    91,690.72x = 137,508.05 × 63,409.50
  4. Step 4: Simplify right side
    91,690.72x = 8,719,316,855.00
  5. Step 5: Solve for x
    x = 8,719,316,855.00/91,690.72
  6. Step 6: Final answer
    x = 95,094.87

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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.