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Finding the Fourth Proportional to 543.18, 815.13 and 421.02

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Solution

The fourth proportional to 543.18, 815.13 and 421.02 is: 631.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.18 : 815.13 = 421.02 : x
  2. Step 2: Convert to fraction form
    543.18/815.13 = 421.02/x
  3. Step 3: Cross multiply
    543.18x = 815.13 × 421.02
  4. Step 4: Simplify right side
    543.18x = 343,186.03
  5. Step 5: Solve for x
    x = 343,186.03/543.18
  6. Step 6: Final answer
    x = 631.81

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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.