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Finding the Fourth Proportional to 912.48, 1,259.22 and 519.50

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Solution

The fourth proportional to 912.48, 1,259.22 and 519.50 is: 716.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.48 : 1,259.22 = 519.50 : x
  2. Step 2: Convert to fraction form
    912.48/1,259.22 = 519.50/x
  3. Step 3: Cross multiply
    912.48x = 1,259.22 × 519.50
  4. Step 4: Simplify right side
    912.48x = 654,164.79
  5. Step 5: Solve for x
    x = 654,164.79/912.48
  6. Step 6: Final answer
    x = 716.91

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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.