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Finding the Fourth Proportional to 543.65, 811.99 and 435.11

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Solution

The fourth proportional to 543.65, 811.99 and 435.11 is: 649.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.65 : 811.99 = 435.11 : x
  2. Step 2: Convert to fraction form
    543.65/811.99 = 435.11/x
  3. Step 3: Cross multiply
    543.65x = 811.99 × 435.11
  4. Step 4: Simplify right side
    543.65x = 353,304.97
  5. Step 5: Solve for x
    x = 353,304.97/543.65
  6. Step 6: Final answer
    x = 649.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.