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Finding the Fourth Proportional to 393.35, 542.93 and 387.43

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Solution

The fourth proportional to 393.35, 542.93 and 387.43 is: 534.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.35 : 542.93 = 387.43 : x
  2. Step 2: Convert to fraction form
    393.35/542.93 = 387.43/x
  3. Step 3: Cross multiply
    393.35x = 542.93 × 387.43
  4. Step 4: Simplify right side
    393.35x = 210,347.37
  5. Step 5: Solve for x
    x = 210,347.37/393.35
  6. Step 6: Final answer
    x = 534.76

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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.