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Finding the Fourth Proportional to 543.20, 814.80 and 235.40

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Solution

The fourth proportional to 543.20, 814.80 and 235.40 is: 353.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.20 : 814.80 = 235.40 : x
  2. Step 2: Convert to fraction form
    543.20/814.80 = 235.40/x
  3. Step 3: Cross multiply
    543.20x = 814.80 × 235.40
  4. Step 4: Simplify right side
    543.20x = 191,803.92
  5. Step 5: Solve for x
    x = 191,803.92/543.20
  6. Step 6: Final answer
    x = 353.10

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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.