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Finding the Fourth Proportional to 974.40, 1,344.24 and 663.36

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Solution

The fourth proportional to 974.40, 1,344.24 and 663.36 is: 915.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.40 : 1,344.24 = 663.36 : x
  2. Step 2: Convert to fraction form
    974.40/1,344.24 = 663.36/x
  3. Step 3: Cross multiply
    974.40x = 1,344.24 × 663.36
  4. Step 4: Simplify right side
    974.40x = 891,715.05
  5. Step 5: Solve for x
    x = 891,715.05/974.40
  6. Step 6: Final answer
    x = 915.14

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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.