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Finding the Fourth Proportional to 1,187.15, 1,781.32 and 571.38

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Solution

The fourth proportional to 1,187.15, 1,781.32 and 571.38 is: 857.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.15 : 1,781.32 = 571.38 : x
  2. Step 2: Convert to fraction form
    1,187.15/1,781.32 = 571.38/x
  3. Step 3: Cross multiply
    1,187.15x = 1,781.32 × 571.38
  4. Step 4: Simplify right side
    1,187.15x = 1,017,809.19
  5. Step 5: Solve for x
    x = 1,017,809.19/1,187.15
  6. Step 6: Final answer
    x = 857.35

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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.