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Finding the Fourth Proportional to 912.40, 1,259.04 and 519.52

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Solution

The fourth proportional to 912.40, 1,259.04 and 519.52 is: 716.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.40 : 1,259.04 = 519.52 : x
  2. Step 2: Convert to fraction form
    912.40/1,259.04 = 519.52/x
  3. Step 3: Cross multiply
    912.40x = 1,259.04 × 519.52
  4. Step 4: Simplify right side
    912.40x = 654,096.46
  5. Step 5: Solve for x
    x = 654,096.46/912.40
  6. Step 6: Final answer
    x = 716.90

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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.