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Finding the Fourth Proportional to 903.89, 1,247.18 and 571.92

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Solution

The fourth proportional to 903.89, 1,247.18 and 571.92 is: 789.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.89 : 1,247.18 = 571.92 : x
  2. Step 2: Convert to fraction form
    903.89/1,247.18 = 571.92/x
  3. Step 3: Cross multiply
    903.89x = 1,247.18 × 571.92
  4. Step 4: Simplify right side
    903.89x = 713,284.33
  5. Step 5: Solve for x
    x = 713,284.33/903.89
  6. Step 6: Final answer
    x = 789.13

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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.