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Finding the Fourth Proportional to 1,275.85, 1,915.53 and 659.98

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Solution

The fourth proportional to 1,275.85, 1,915.53 and 659.98 is: 990.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.85 : 1,915.53 = 659.98 : x
  2. Step 2: Convert to fraction form
    1,275.85/1,915.53 = 659.98/x
  3. Step 3: Cross multiply
    1,275.85x = 1,915.53 × 659.98
  4. Step 4: Simplify right side
    1,275.85x = 1,264,211.49
  5. Step 5: Solve for x
    x = 1,264,211.49/1,275.85
  6. Step 6: Final answer
    x = 990.88

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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.