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Finding the Fourth Proportional to 912.30, 1,258.86 and 519.27

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Solution

The fourth proportional to 912.30, 1,258.86 and 519.27 is: 716.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.30 : 1,258.86 = 519.27 : x
  2. Step 2: Convert to fraction form
    912.30/1,258.86 = 519.27/x
  3. Step 3: Cross multiply
    912.30x = 1,258.86 × 519.27
  4. Step 4: Simplify right side
    912.30x = 653,688.23
  5. Step 5: Solve for x
    x = 653,688.23/912.30
  6. Step 6: Final answer
    x = 716.53

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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.