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Finding the Fourth Proportional to 912.30, 1,259.09 and 519.25

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Solution

The fourth proportional to 912.30, 1,259.09 and 519.25 is: 716.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.30 : 1,259.09 = 519.25 : x
  2. Step 2: Convert to fraction form
    912.30/1,259.09 = 519.25/x
  3. Step 3: Cross multiply
    912.30x = 1,259.09 × 519.25
  4. Step 4: Simplify right side
    912.30x = 653,781.05
  5. Step 5: Solve for x
    x = 653,781.05/912.30
  6. Step 6: Final answer
    x = 716.63

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Double scale
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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.