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Finding the Fourth Proportional to 968.58, 1,337.18 and 915.12

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Solution

The fourth proportional to 968.58, 1,337.18 and 915.12 is: 1,263.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.58 : 1,337.18 = 915.12 : x
  2. Step 2: Convert to fraction form
    968.58/1,337.18 = 915.12/x
  3. Step 3: Cross multiply
    968.58x = 1,337.18 × 915.12
  4. Step 4: Simplify right side
    968.58x = 1,223,675.59
  5. Step 5: Solve for x
    x = 1,223,675.59/968.58
  6. Step 6: Final answer
    x = 1,263.37

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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.