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Finding the Fourth Proportional to 1,187.91, 1,781.21 and 365.95

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Solution

The fourth proportional to 1,187.91, 1,781.21 and 365.95 is: 548.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.91 : 1,781.21 = 365.95 : x
  2. Step 2: Convert to fraction form
    1,187.91/1,781.21 = 365.95/x
  3. Step 3: Cross multiply
    1,187.91x = 1,781.21 × 365.95
  4. Step 4: Simplify right side
    1,187.91x = 651,831.97
  5. Step 5: Solve for x
    x = 651,831.97/1,187.91
  6. Step 6: Final answer
    x = 548.72

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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.