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Finding the Fourth Proportional to 91,814.70, 137,722.05 and 87,926.70

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Solution

The fourth proportional to 91,814.70, 137,722.05 and 87,926.70 is: 131,890.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,814.70 : 137,722.05 = 87,926.70 : x
  2. Step 2: Convert to fraction form
    91,814.70/137,722.05 = 87,926.70/x
  3. Step 3: Cross multiply
    91,814.70x = 137,722.05 × 87,926.70
  4. Step 4: Simplify right side
    91,814.70x = 12,109,445,373.74
  5. Step 5: Solve for x
    x = 12,109,445,373.74/91,814.70
  6. Step 6: Final answer
    x = 131,890.05

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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.