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Finding the Fourth Proportional to 994.40, 1,372.56 and 663.08

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Solution

The fourth proportional to 994.40, 1,372.56 and 663.08 is: 915.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.40 : 1,372.56 = 663.08 : x
  2. Step 2: Convert to fraction form
    994.40/1,372.56 = 663.08/x
  3. Step 3: Cross multiply
    994.40x = 1,372.56 × 663.08
  4. Step 4: Simplify right side
    994.40x = 910,117.08
  5. Step 5: Solve for x
    x = 910,117.08/994.40
  6. Step 6: Final answer
    x = 915.24

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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.