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Finding the Fourth Proportional to 91,143.80, 136,715.70 and 51,121.70

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Solution

The fourth proportional to 91,143.80, 136,715.70 and 51,121.70 is: 76,682.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,143.80 : 136,715.70 = 51,121.70 : x
  2. Step 2: Convert to fraction form
    91,143.80/136,715.70 = 51,121.70/x
  3. Step 3: Cross multiply
    91,143.80x = 136,715.70 × 51,121.70
  4. Step 4: Simplify right side
    91,143.80x = 6,989,139,000.69
  5. Step 5: Solve for x
    x = 6,989,139,000.69/91,143.80
  6. Step 6: Final answer
    x = 76,682.55

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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.