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Finding the Fourth Proportional to 1,142.08, 1,575.78 and 722.42

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Solution

The fourth proportional to 1,142.08, 1,575.78 and 722.42 is: 996.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.08 : 1,575.78 = 722.42 : x
  2. Step 2: Convert to fraction form
    1,142.08/1,575.78 = 722.42/x
  3. Step 3: Cross multiply
    1,142.08x = 1,575.78 × 722.42
  4. Step 4: Simplify right side
    1,142.08x = 1,138,374.99
  5. Step 5: Solve for x
    x = 1,138,374.99/1,142.08
  6. Step 6: Final answer
    x = 996.76

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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.