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Finding the Fourth Proportional to 1,186.52, 1,779.17 and 638.15

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Solution

The fourth proportional to 1,186.52, 1,779.17 and 638.15 is: 956.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.52 : 1,779.17 = 638.15 : x
  2. Step 2: Convert to fraction form
    1,186.52/1,779.17 = 638.15/x
  3. Step 3: Cross multiply
    1,186.52x = 1,779.17 × 638.15
  4. Step 4: Simplify right side
    1,186.52x = 1,135,365.25
  5. Step 5: Solve for x
    x = 1,135,365.25/1,186.52
  6. Step 6: Final answer
    x = 956.89

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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.