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Finding the Fourth Proportional to 912.71, 1,259.48 and 539.91

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Solution

The fourth proportional to 912.71, 1,259.48 and 539.91 is: 745.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.71 : 1,259.48 = 539.91 : x
  2. Step 2: Convert to fraction form
    912.71/1,259.48 = 539.91/x
  3. Step 3: Cross multiply
    912.71x = 1,259.48 × 539.91
  4. Step 4: Simplify right side
    912.71x = 680,007.20
  5. Step 5: Solve for x
    x = 680,007.20/912.71
  6. Step 6: Final answer
    x = 745.04

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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.