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Finding the Fourth Proportional to 1,013.13, 1,397.89 and 639.66

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Solution

The fourth proportional to 1,013.13, 1,397.89 and 639.66 is: 882.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.13 : 1,397.89 = 639.66 : x
  2. Step 2: Convert to fraction form
    1,013.13/1,397.89 = 639.66/x
  3. Step 3: Cross multiply
    1,013.13x = 1,397.89 × 639.66
  4. Step 4: Simplify right side
    1,013.13x = 894,172.72
  5. Step 5: Solve for x
    x = 894,172.72/1,013.13
  6. Step 6: Final answer
    x = 882.58

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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.