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Finding the Fourth Proportional to 1,387.62, 1,915.18 and 890.89

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Solution

The fourth proportional to 1,387.62, 1,915.18 and 890.89 is: 1,229.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.62 : 1,915.18 = 890.89 : x
  2. Step 2: Convert to fraction form
    1,387.62/1,915.18 = 890.89/x
  3. Step 3: Cross multiply
    1,387.62x = 1,915.18 × 890.89
  4. Step 4: Simplify right side
    1,387.62x = 1,706,207.44
  5. Step 5: Solve for x
    x = 1,706,207.44/1,387.62
  6. Step 6: Final answer
    x = 1,229.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.