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Finding the Fourth Proportional to 1,191.18, 1,642.95 and 818.22

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Solution

The fourth proportional to 1,191.18, 1,642.95 and 818.22 is: 1,128.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.18 : 1,642.95 = 818.22 : x
  2. Step 2: Convert to fraction form
    1,191.18/1,642.95 = 818.22/x
  3. Step 3: Cross multiply
    1,191.18x = 1,642.95 × 818.22
  4. Step 4: Simplify right side
    1,191.18x = 1,344,294.55
  5. Step 5: Solve for x
    x = 1,344,294.55/1,191.18
  6. Step 6: Final answer
    x = 1,128.54

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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.