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Finding the Fourth Proportional to 1,247.64, 1,871.89 and 784.88

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Solution

The fourth proportional to 1,247.64, 1,871.89 and 784.88 is: 1,177.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.64 : 1,871.89 = 784.88 : x
  2. Step 2: Convert to fraction form
    1,247.64/1,871.89 = 784.88/x
  3. Step 3: Cross multiply
    1,247.64x = 1,871.89 × 784.88
  4. Step 4: Simplify right side
    1,247.64x = 1,469,209.02
  5. Step 5: Solve for x
    x = 1,469,209.02/1,247.64
  6. Step 6: Final answer
    x = 1,177.59

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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.