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Finding the Fourth Proportional to 91,139.80, 136,709.70 and 51,117.70

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Solution

The fourth proportional to 91,139.80, 136,709.70 and 51,117.70 is: 76,676.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,139.80 : 136,709.70 = 51,117.70 : x
  2. Step 2: Convert to fraction form
    91,139.80/136,709.70 = 51,117.70/x
  3. Step 3: Cross multiply
    91,139.80x = 136,709.70 × 51,117.70
  4. Step 4: Simplify right side
    91,139.80x = 6,988,285,431.69
  5. Step 5: Solve for x
    x = 6,988,285,431.69/91,139.80
  6. Step 6: Final answer
    x = 76,676.55

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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.