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Finding the Fourth Proportional to 904.21, 1,247.82 and 531.21

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Solution

The fourth proportional to 904.21, 1,247.82 and 531.21 is: 733.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.21 : 1,247.82 = 531.21 : x
  2. Step 2: Convert to fraction form
    904.21/1,247.82 = 531.21/x
  3. Step 3: Cross multiply
    904.21x = 1,247.82 × 531.21
  4. Step 4: Simplify right side
    904.21x = 662,853.12
  5. Step 5: Solve for x
    x = 662,853.12/904.21
  6. Step 6: Final answer
    x = 733.07

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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.