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Finding the Fourth Proportional to 915.09, 1,369.43 and 655.38

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Solution

The fourth proportional to 915.09, 1,369.43 and 655.38 is: 980.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.09 : 1,369.43 = 655.38 : x
  2. Step 2: Convert to fraction form
    915.09/1,369.43 = 655.38/x
  3. Step 3: Cross multiply
    915.09x = 1,369.43 × 655.38
  4. Step 4: Simplify right side
    915.09x = 897,497.03
  5. Step 5: Solve for x
    x = 897,497.03/915.09
  6. Step 6: Final answer
    x = 980.77

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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.