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Finding the Fourth Proportional to 904.39, 1,247.67 and 572.23

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Solution

The fourth proportional to 904.39, 1,247.67 and 572.23 is: 789.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.39 : 1,247.67 = 572.23 : x
  2. Step 2: Convert to fraction form
    904.39/1,247.67 = 572.23/x
  3. Step 3: Cross multiply
    904.39x = 1,247.67 × 572.23
  4. Step 4: Simplify right side
    904.39x = 713,954.20
  5. Step 5: Solve for x
    x = 713,954.20/904.39
  6. Step 6: Final answer
    x = 789.43

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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.