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Finding the Fourth Proportional to 915.11, 1,369.82 and 740.32

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Solution

The fourth proportional to 915.11, 1,369.82 and 740.32 is: 1,108.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.11 : 1,369.82 = 740.32 : x
  2. Step 2: Convert to fraction form
    915.11/1,369.82 = 740.32/x
  3. Step 3: Cross multiply
    915.11x = 1,369.82 × 740.32
  4. Step 4: Simplify right side
    915.11x = 1,014,105.14
  5. Step 5: Solve for x
    x = 1,014,105.14/915.11
  6. Step 6: Final answer
    x = 1,108.18

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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.