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Finding the Fourth Proportional to 323.16, 484.40 and 140.40

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Solution

The fourth proportional to 323.16, 484.40 and 140.40 is: 210.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.16 : 484.40 = 140.40 : x
  2. Step 2: Convert to fraction form
    323.16/484.40 = 140.40/x
  3. Step 3: Cross multiply
    323.16x = 484.40 × 140.40
  4. Step 4: Simplify right side
    323.16x = 68,009.76
  5. Step 5: Solve for x
    x = 68,009.76/323.16
  6. Step 6: Final answer
    x = 210.45

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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.