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Finding the Fourth Proportional to 543.61, 749.13 and 388.09

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Solution

The fourth proportional to 543.61, 749.13 and 388.09 is: 534.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.61 : 749.13 = 388.09 : x
  2. Step 2: Convert to fraction form
    543.61/749.13 = 388.09/x
  3. Step 3: Cross multiply
    543.61x = 749.13 × 388.09
  4. Step 4: Simplify right side
    543.61x = 290,729.86
  5. Step 5: Solve for x
    x = 290,729.86/543.61
  6. Step 6: Final answer
    x = 534.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.