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Finding the Fourth Proportional to 330.40, 454.87 and 247.40

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Solution

The fourth proportional to 330.40, 454.87 and 247.40 is: 340.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.40 : 454.87 = 247.40 : x
  2. Step 2: Convert to fraction form
    330.40/454.87 = 247.40/x
  3. Step 3: Cross multiply
    330.40x = 454.87 × 247.40
  4. Step 4: Simplify right side
    330.40x = 112,535.75
  5. Step 5: Solve for x
    x = 112,535.75/330.40
  6. Step 6: Final answer
    x = 340.60

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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.