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Finding the Fourth Proportional to 912.27, 1,258.93 and 519.32

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Solution

The fourth proportional to 912.27, 1,258.93 and 519.32 is: 716.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.27 : 1,258.93 = 519.32 : x
  2. Step 2: Convert to fraction form
    912.27/1,258.93 = 519.32/x
  3. Step 3: Cross multiply
    912.27x = 1,258.93 × 519.32
  4. Step 4: Simplify right side
    912.27x = 653,784.38
  5. Step 5: Solve for x
    x = 653,784.38/912.27
  6. Step 6: Final answer
    x = 716.65

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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.