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Finding the Fourth Proportional to 1,274.94, 1,915.90 and 659.14

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Solution

The fourth proportional to 1,274.94, 1,915.90 and 659.14 is: 990.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.94 : 1,915.90 = 659.14 : x
  2. Step 2: Convert to fraction form
    1,274.94/1,915.90 = 659.14/x
  3. Step 3: Cross multiply
    1,274.94x = 1,915.90 × 659.14
  4. Step 4: Simplify right side
    1,274.94x = 1,262,843.60
  5. Step 5: Solve for x
    x = 1,262,843.60/1,274.94
  6. Step 6: Final answer
    x = 990.51

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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.