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Finding the Fourth Proportional to 915.40, 1,370.82 and 708.24

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Solution

The fourth proportional to 915.40, 1,370.82 and 708.24 is: 1,060.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.40 : 1,370.82 = 708.24 : x
  2. Step 2: Convert to fraction form
    915.40/1,370.82 = 708.24/x
  3. Step 3: Cross multiply
    915.40x = 1,370.82 × 708.24
  4. Step 4: Simplify right side
    915.40x = 970,877.35
  5. Step 5: Solve for x
    x = 970,877.35/915.40
  6. Step 6: Final answer
    x = 1,060.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.