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Finding the Fourth Proportional to 1,122.84, 1,679.40 and 915.84

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Solution

The fourth proportional to 1,122.84, 1,679.40 and 915.84 is: 1,369.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.84 : 1,679.40 = 915.84 : x
  2. Step 2: Convert to fraction form
    1,122.84/1,679.40 = 915.84/x
  3. Step 3: Cross multiply
    1,122.84x = 1,679.40 × 915.84
  4. Step 4: Simplify right side
    1,122.84x = 1,538,061.70
  5. Step 5: Solve for x
    x = 1,538,061.70/1,122.84
  6. Step 6: Final answer
    x = 1,369.80

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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.