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Finding the Fourth Proportional to 912.93, 1,259.73 and 519.90

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Solution

The fourth proportional to 912.93, 1,259.73 and 519.90 is: 717.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.93 : 1,259.73 = 519.90 : x
  2. Step 2: Convert to fraction form
    912.93/1,259.73 = 519.90/x
  3. Step 3: Cross multiply
    912.93x = 1,259.73 × 519.90
  4. Step 4: Simplify right side
    912.93x = 654,933.63
  5. Step 5: Solve for x
    x = 654,933.63/912.93
  6. Step 6: Final answer
    x = 717.40

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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.