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Finding the Fourth Proportional to 1,142.22, 1,575.47 and 699.35

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Solution

The fourth proportional to 1,142.22, 1,575.47 and 699.35 is: 964.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.22 : 1,575.47 = 699.35 : x
  2. Step 2: Convert to fraction form
    1,142.22/1,575.47 = 699.35/x
  3. Step 3: Cross multiply
    1,142.22x = 1,575.47 × 699.35
  4. Step 4: Simplify right side
    1,142.22x = 1,101,793.57
  5. Step 5: Solve for x
    x = 1,101,793.57/1,142.22
  6. Step 6: Final answer
    x = 964.61

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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.