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Finding the Fourth Proportional to 1,211.32, 1,672.13 and 818.87

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Solution

The fourth proportional to 1,211.32, 1,672.13 and 818.87 is: 1,130.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.32 : 1,672.13 = 818.87 : x
  2. Step 2: Convert to fraction form
    1,211.32/1,672.13 = 818.87/x
  3. Step 3: Cross multiply
    1,211.32x = 1,672.13 × 818.87
  4. Step 4: Simplify right side
    1,211.32x = 1,369,253.00
  5. Step 5: Solve for x
    x = 1,369,253.00/1,211.32
  6. Step 6: Final answer
    x = 1,130.39

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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.