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Finding the Fourth Proportional to 1,187.67, 1,781.89 and 571.42

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Solution

The fourth proportional to 1,187.67, 1,781.89 and 571.42 is: 857.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.67 : 1,781.89 = 571.42 : x
  2. Step 2: Convert to fraction form
    1,187.67/1,781.89 = 571.42/x
  3. Step 3: Cross multiply
    1,187.67x = 1,781.89 × 571.42
  4. Step 4: Simplify right side
    1,187.67x = 1,018,204.73
  5. Step 5: Solve for x
    x = 1,018,204.73/1,187.67
  6. Step 6: Final answer
    x = 857.32

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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.