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Finding the Fourth Proportional to 862.13, 1,188.36 and 660.71

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Solution

The fourth proportional to 862.13, 1,188.36 and 660.71 is: 910.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.13 : 1,188.36 = 660.71 : x
  2. Step 2: Convert to fraction form
    862.13/1,188.36 = 660.71/x
  3. Step 3: Cross multiply
    862.13x = 1,188.36 × 660.71
  4. Step 4: Simplify right side
    862.13x = 785,161.34
  5. Step 5: Solve for x
    x = 785,161.34/862.13
  6. Step 6: Final answer
    x = 910.72

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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.