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Finding the Fourth Proportional to 1,218.70, 1,827.02 and 487.88

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Solution

The fourth proportional to 1,218.70, 1,827.02 and 487.88 is: 731.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.70 : 1,827.02 = 487.88 : x
  2. Step 2: Convert to fraction form
    1,218.70/1,827.02 = 487.88/x
  3. Step 3: Cross multiply
    1,218.70x = 1,827.02 × 487.88
  4. Step 4: Simplify right side
    1,218.70x = 891,357.38
  5. Step 5: Solve for x
    x = 891,357.38/1,218.70
  6. Step 6: Final answer
    x = 731.40

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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.