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Finding the Fourth Proportional to 1,013.10, 1,397.15 and 663.98

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Solution

The fourth proportional to 1,013.10, 1,397.15 and 663.98 is: 915.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.10 : 1,397.15 = 663.98 : x
  2. Step 2: Convert to fraction form
    1,013.10/1,397.15 = 663.98/x
  3. Step 3: Cross multiply
    1,013.10x = 1,397.15 × 663.98
  4. Step 4: Simplify right side
    1,013.10x = 927,679.66
  5. Step 5: Solve for x
    x = 927,679.66/1,013.10
  6. Step 6: Final answer
    x = 915.68

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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.