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Finding the Fourth Proportional to 869.92, 1,200.05 and 660.13

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Solution

The fourth proportional to 869.92, 1,200.05 and 660.13 is: 910.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.92 : 1,200.05 = 660.13 : x
  2. Step 2: Convert to fraction form
    869.92/1,200.05 = 660.13/x
  3. Step 3: Cross multiply
    869.92x = 1,200.05 × 660.13
  4. Step 4: Simplify right side
    869.92x = 792,182.71
  5. Step 5: Solve for x
    x = 792,182.71/869.92
  6. Step 6: Final answer
    x = 910.64

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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.