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Finding the Fourth Proportional to 279.04, 420.20 and 243.40

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Solution

The fourth proportional to 279.04, 420.20 and 243.40 is: 366.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.04 : 420.20 = 243.40 : x
  2. Step 2: Convert to fraction form
    279.04/420.20 = 243.40/x
  3. Step 3: Cross multiply
    279.04x = 420.20 × 243.40
  4. Step 4: Simplify right side
    279.04x = 102,276.68
  5. Step 5: Solve for x
    x = 102,276.68/279.04
  6. Step 6: Final answer
    x = 366.53

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.