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Finding the Fourth Proportional to 912.42, 1,259.07 and 519.39

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Solution

The fourth proportional to 912.42, 1,259.07 and 519.39 is: 716.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.42 : 1,259.07 = 519.39 : x
  2. Step 2: Convert to fraction form
    912.42/1,259.07 = 519.39/x
  3. Step 3: Cross multiply
    912.42x = 1,259.07 × 519.39
  4. Step 4: Simplify right side
    912.42x = 653,948.37
  5. Step 5: Solve for x
    x = 653,948.37/912.42
  6. Step 6: Final answer
    x = 716.72

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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.