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Finding the Fourth Proportional to 912.20, 1,259.79 and 717.14

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Solution

The fourth proportional to 912.20, 1,259.79 and 717.14 is: 990.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.20 : 1,259.79 = 717.14 : x
  2. Step 2: Convert to fraction form
    912.20/1,259.79 = 717.14/x
  3. Step 3: Cross multiply
    912.20x = 1,259.79 × 717.14
  4. Step 4: Simplify right side
    912.20x = 903,445.80
  5. Step 5: Solve for x
    x = 903,445.80/912.20
  6. Step 6: Final answer
    x = 990.40

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Double scale
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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.