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Finding the Fourth Proportional to 905.92, 1,250.88 and 709.12

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Solution

The fourth proportional to 905.92, 1,250.88 and 709.12 is: 979.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.92 : 1,250.88 = 709.12 : x
  2. Step 2: Convert to fraction form
    905.92/1,250.88 = 709.12/x
  3. Step 3: Cross multiply
    905.92x = 1,250.88 × 709.12
  4. Step 4: Simplify right side
    905.92x = 887,024.03
  5. Step 5: Solve for x
    x = 887,024.03/905.92
  6. Step 6: Final answer
    x = 979.14

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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.