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Finding the Fourth Proportional to 1,142.33, 1,714.02 and 621.55

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Solution

The fourth proportional to 1,142.33, 1,714.02 and 621.55 is: 932.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.33 : 1,714.02 = 621.55 : x
  2. Step 2: Convert to fraction form
    1,142.33/1,714.02 = 621.55/x
  3. Step 3: Cross multiply
    1,142.33x = 1,714.02 × 621.55
  4. Step 4: Simplify right side
    1,142.33x = 1,065,347.58
  5. Step 5: Solve for x
    x = 1,065,347.58/1,142.33
  6. Step 6: Final answer
    x = 932.61

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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.