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Finding the Fourth Proportional to 913.09, 1,259.76 and 519.84

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Solution

The fourth proportional to 913.09, 1,259.76 and 519.84 is: 717.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.09 : 1,259.76 = 519.84 : x
  2. Step 2: Convert to fraction form
    913.09/1,259.76 = 519.84/x
  3. Step 3: Cross multiply
    913.09x = 1,259.76 × 519.84
  4. Step 4: Simplify right side
    913.09x = 654,867.94
  5. Step 5: Solve for x
    x = 654,867.94/913.09
  6. Step 6: Final answer
    x = 717.20

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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.