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Finding the Fourth Proportional to 322.12, 483.24 and 139.48

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Solution

The fourth proportional to 322.12, 483.24 and 139.48 is: 209.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.12 : 483.24 = 139.48 : x
  2. Step 2: Convert to fraction form
    322.12/483.24 = 139.48/x
  3. Step 3: Cross multiply
    322.12x = 483.24 × 139.48
  4. Step 4: Simplify right side
    322.12x = 67,402.32
  5. Step 5: Solve for x
    x = 67,402.32/322.12
  6. Step 6: Final answer
    x = 209.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.