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Finding the Fourth Proportional to 91,981.80, 137,972.70 and 45,325.80

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Solution

The fourth proportional to 91,981.80, 137,972.70 and 45,325.80 is: 67,988.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,981.80 : 137,972.70 = 45,325.80 : x
  2. Step 2: Convert to fraction form
    91,981.80/137,972.70 = 45,325.80/x
  3. Step 3: Cross multiply
    91,981.80x = 137,972.70 × 45,325.80
  4. Step 4: Simplify right side
    91,981.80x = 6,253,723,005.66
  5. Step 5: Solve for x
    x = 6,253,723,005.66/91,981.80
  6. Step 6: Final answer
    x = 67,988.70

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1.5x scale

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.