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Finding the Fourth Proportional to 1,003.55, 1,384.97 and 708.89

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Solution

The fourth proportional to 1,003.55, 1,384.97 and 708.89 is: 978.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.55 : 1,384.97 = 708.89 : x
  2. Step 2: Convert to fraction form
    1,003.55/1,384.97 = 708.89/x
  3. Step 3: Cross multiply
    1,003.55x = 1,384.97 × 708.89
  4. Step 4: Simplify right side
    1,003.55x = 981,780.91
  5. Step 5: Solve for x
    x = 981,780.91/1,003.55
  6. Step 6: Final answer
    x = 978.31

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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.