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Finding the Fourth Proportional to 91,159.80, 136,739.70 and 51,137.70

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Solution

The fourth proportional to 91,159.80, 136,739.70 and 51,137.70 is: 76,706.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,159.80 : 136,739.70 = 51,137.70 : x
  2. Step 2: Convert to fraction form
    91,159.80/136,739.70 = 51,137.70/x
  3. Step 3: Cross multiply
    91,159.80x = 136,739.70 × 51,137.70
  4. Step 4: Simplify right side
    91,159.80x = 6,992,553,756.69
  5. Step 5: Solve for x
    x = 6,992,553,756.69/91,159.80
  6. Step 6: Final answer
    x = 76,706.55

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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.