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Finding the Fourth Proportional to 1,276.67, 1,915.49 and 659.99

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Solution

The fourth proportional to 1,276.67, 1,915.49 and 659.99 is: 990.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.67 : 1,915.49 = 659.99 : x
  2. Step 2: Convert to fraction form
    1,276.67/1,915.49 = 659.99/x
  3. Step 3: Cross multiply
    1,276.67x = 1,915.49 × 659.99
  4. Step 4: Simplify right side
    1,276.67x = 1,264,204.25
  5. Step 5: Solve for x
    x = 1,264,204.25/1,276.67
  6. Step 6: Final answer
    x = 990.24

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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.