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Finding the Fourth Proportional to 543.76, 817.45 and 429.57

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Solution

The fourth proportional to 543.76, 817.45 and 429.57 is: 645.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.76 : 817.45 = 429.57 : x
  2. Step 2: Convert to fraction form
    543.76/817.45 = 429.57/x
  3. Step 3: Cross multiply
    543.76x = 817.45 × 429.57
  4. Step 4: Simplify right side
    543.76x = 351,150.92
  5. Step 5: Solve for x
    x = 351,150.92/543.76
  6. Step 6: Final answer
    x = 645.79

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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.