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Finding the Fourth Proportional to 1,189.96, 1,641.37 and 747.47

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Solution

The fourth proportional to 1,189.96, 1,641.37 and 747.47 is: 1,031.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.96 : 1,641.37 = 747.47 : x
  2. Step 2: Convert to fraction form
    1,189.96/1,641.37 = 747.47/x
  3. Step 3: Cross multiply
    1,189.96x = 1,641.37 × 747.47
  4. Step 4: Simplify right side
    1,189.96x = 1,226,874.83
  5. Step 5: Solve for x
    x = 1,226,874.83/1,189.96
  6. Step 6: Final answer
    x = 1,031.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.