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Finding the Fourth Proportional to 91,251.64, 136,764.45 and 51,688.81

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Solution

The fourth proportional to 91,251.64, 136,764.45 and 51,688.81 is: 77,469.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,251.64 : 136,764.45 = 51,688.81 : x
  2. Step 2: Convert to fraction form
    91,251.64/136,764.45 = 51,688.81/x
  3. Step 3: Cross multiply
    91,251.64x = 136,764.45 × 51,688.81
  4. Step 4: Simplify right side
    91,251.64x = 7,069,191,670.80
  5. Step 5: Solve for x
    x = 7,069,191,670.80/91,251.64
  6. Step 6: Final answer
    x = 77,469.20

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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.