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Finding the Fourth Proportional to 912.82, 1,259.68 and 519.82

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Solution

The fourth proportional to 912.82, 1,259.68 and 519.82 is: 717.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.82 : 1,259.68 = 519.82 : x
  2. Step 2: Convert to fraction form
    912.82/1,259.68 = 519.82/x
  3. Step 3: Cross multiply
    912.82x = 1,259.68 × 519.82
  4. Step 4: Simplify right side
    912.82x = 654,806.86
  5. Step 5: Solve for x
    x = 654,806.86/912.82
  6. Step 6: Final answer
    x = 717.34

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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.