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Finding the Fourth Proportional to 1,042.80, 1,438.61 and 688.27

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Solution

The fourth proportional to 1,042.80, 1,438.61 and 688.27 is: 949.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.80 : 1,438.61 = 688.27 : x
  2. Step 2: Convert to fraction form
    1,042.80/1,438.61 = 688.27/x
  3. Step 3: Cross multiply
    1,042.80x = 1,438.61 × 688.27
  4. Step 4: Simplify right side
    1,042.80x = 990,152.10
  5. Step 5: Solve for x
    x = 990,152.10/1,042.80
  6. Step 6: Final answer
    x = 949.51

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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.