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Finding the Fourth Proportional to 543.20, 749.55 and 307.12

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Solution

The fourth proportional to 543.20, 749.55 and 307.12 is: 423.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.20 : 749.55 = 307.12 : x
  2. Step 2: Convert to fraction form
    543.20/749.55 = 307.12/x
  3. Step 3: Cross multiply
    543.20x = 749.55 × 307.12
  4. Step 4: Simplify right side
    543.20x = 230,201.80
  5. Step 5: Solve for x
    x = 230,201.80/543.20
  6. Step 6: Final answer
    x = 423.79

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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.