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Finding the Fourth Proportional to 543.36, 815.36 and 421.76

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Solution

The fourth proportional to 543.36, 815.36 and 421.76 is: 632.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.36 : 815.36 = 421.76 : x
  2. Step 2: Convert to fraction form
    543.36/815.36 = 421.76/x
  3. Step 3: Cross multiply
    543.36x = 815.36 × 421.76
  4. Step 4: Simplify right side
    543.36x = 343,886.23
  5. Step 5: Solve for x
    x = 343,886.23/543.36
  6. Step 6: Final answer
    x = 632.89

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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.