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Finding the Fourth Proportional to 1,189.42, 1,641.74 and 691.97

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Solution

The fourth proportional to 1,189.42, 1,641.74 and 691.97 is: 955.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.42 : 1,641.74 = 691.97 : x
  2. Step 2: Convert to fraction form
    1,189.42/1,641.74 = 691.97/x
  3. Step 3: Cross multiply
    1,189.42x = 1,641.74 × 691.97
  4. Step 4: Simplify right side
    1,189.42x = 1,136,034.83
  5. Step 5: Solve for x
    x = 1,136,034.83/1,189.42
  6. Step 6: Final answer
    x = 955.12

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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.