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Finding the Fourth Proportional to 915.62, 1,370.57 and 740.82

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Solution

The fourth proportional to 915.62, 1,370.57 and 740.82 is: 1,108.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.62 : 1,370.57 = 740.82 : x
  2. Step 2: Convert to fraction form
    915.62/1,370.57 = 740.82/x
  3. Step 3: Cross multiply
    915.62x = 1,370.57 × 740.82
  4. Step 4: Simplify right side
    915.62x = 1,015,341.96
  5. Step 5: Solve for x
    x = 1,015,341.96/915.62
  6. Step 6: Final answer
    x = 1,108.92

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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.