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Finding the Fourth Proportional to 91,313.85, 136,981.71 and 38,716.50

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Solution

The fourth proportional to 91,313.85, 136,981.71 and 38,716.50 is: 58,079.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,313.85 : 136,981.71 = 38,716.50 : x
  2. Step 2: Convert to fraction form
    91,313.85/136,981.71 = 38,716.50/x
  3. Step 3: Cross multiply
    91,313.85x = 136,981.71 × 38,716.50
  4. Step 4: Simplify right side
    91,313.85x = 5,303,452,375.22
  5. Step 5: Solve for x
    x = 5,303,452,375.22/91,313.85
  6. Step 6: Final answer
    x = 58,079.39

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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.