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Finding the Fourth Proportional to 1,042.63, 1,438.48 and 688.73

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Solution

The fourth proportional to 1,042.63, 1,438.48 and 688.73 is: 950.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.63 : 1,438.48 = 688.73 : x
  2. Step 2: Convert to fraction form
    1,042.63/1,438.48 = 688.73/x
  3. Step 3: Cross multiply
    1,042.63x = 1,438.48 × 688.73
  4. Step 4: Simplify right side
    1,042.63x = 990,724.33
  5. Step 5: Solve for x
    x = 990,724.33/1,042.63
  6. Step 6: Final answer
    x = 950.22

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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.