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Finding the Fourth Proportional to 1,279.57, 1,915.39 and 693.12

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Solution

The fourth proportional to 1,279.57, 1,915.39 and 693.12 is: 1,037.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.57 : 1,915.39 = 693.12 : x
  2. Step 2: Convert to fraction form
    1,279.57/1,915.39 = 693.12/x
  3. Step 3: Cross multiply
    1,279.57x = 1,915.39 × 693.12
  4. Step 4: Simplify right side
    1,279.57x = 1,327,592.24
  5. Step 5: Solve for x
    x = 1,327,592.24/1,279.57
  6. Step 6: Final answer
    x = 1,037.53

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1.5x scale

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.