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Finding the Fourth Proportional to 543.52, 815.12 and 421.28

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Solution

The fourth proportional to 543.52, 815.12 and 421.28 is: 631.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.52 : 815.12 = 421.28 : x
  2. Step 2: Convert to fraction form
    543.52/815.12 = 421.28/x
  3. Step 3: Cross multiply
    543.52x = 815.12 × 421.28
  4. Step 4: Simplify right side
    543.52x = 343,393.75
  5. Step 5: Solve for x
    x = 343,393.75/543.52
  6. Step 6: Final answer
    x = 631.80

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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.