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Finding the Fourth Proportional to 912.12, 1,258.38 and 580.56

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Solution

The fourth proportional to 912.12, 1,258.38 and 580.56 is: 800.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.12 : 1,258.38 = 580.56 : x
  2. Step 2: Convert to fraction form
    912.12/1,258.38 = 580.56/x
  3. Step 3: Cross multiply
    912.12x = 1,258.38 × 580.56
  4. Step 4: Simplify right side
    912.12x = 730,565.09
  5. Step 5: Solve for x
    x = 730,565.09/912.12
  6. Step 6: Final answer
    x = 800.95

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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.