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Finding the Fourth Proportional to 912.88, 1,259.78 and 519.91

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Solution

The fourth proportional to 912.88, 1,259.78 and 519.91 is: 717.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.88 : 1,259.78 = 519.91 : x
  2. Step 2: Convert to fraction form
    912.88/1,259.78 = 519.91/x
  3. Step 3: Cross multiply
    912.88x = 1,259.78 × 519.91
  4. Step 4: Simplify right side
    912.88x = 654,972.22
  5. Step 5: Solve for x
    x = 654,972.22/912.88
  6. Step 6: Final answer
    x = 717.48

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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.