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Finding the Fourth Proportional to 1,123.92, 1,686.21 and 576.50

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Solution

The fourth proportional to 1,123.92, 1,686.21 and 576.50 is: 864.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.92 : 1,686.21 = 576.50 : x
  2. Step 2: Convert to fraction form
    1,123.92/1,686.21 = 576.50/x
  3. Step 3: Cross multiply
    1,123.92x = 1,686.21 × 576.50
  4. Step 4: Simplify right side
    1,123.92x = 972,091.63
  5. Step 5: Solve for x
    x = 972,091.63/1,123.92
  6. Step 6: Final answer
    x = 864.91

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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.