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Finding the Fourth Proportional to 915.98, 1,373.66 and 422.18

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Solution

The fourth proportional to 915.98, 1,373.66 and 422.18 is: 633.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.98 : 1,373.66 = 422.18 : x
  2. Step 2: Convert to fraction form
    915.98/1,373.66 = 422.18/x
  3. Step 3: Cross multiply
    915.98x = 1,373.66 × 422.18
  4. Step 4: Simplify right side
    915.98x = 579,929.53
  5. Step 5: Solve for x
    x = 579,929.53/915.98
  6. Step 6: Final answer
    x = 633.13

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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.