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Finding the Fourth Proportional to 1,042.67, 1,439.05 and 622.89

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Solution

The fourth proportional to 1,042.67, 1,439.05 and 622.89 is: 859.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.67 : 1,439.05 = 622.89 : x
  2. Step 2: Convert to fraction form
    1,042.67/1,439.05 = 622.89/x
  3. Step 3: Cross multiply
    1,042.67x = 1,439.05 × 622.89
  4. Step 4: Simplify right side
    1,042.67x = 896,362.66
  5. Step 5: Solve for x
    x = 896,362.66/1,042.67
  6. Step 6: Final answer
    x = 859.68

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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.