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Finding the Fourth Proportional to 393.19, 542.60 and 218.53

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Solution

The fourth proportional to 393.19, 542.60 and 218.53 is: 301.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.19 : 542.60 = 218.53 : x
  2. Step 2: Convert to fraction form
    393.19/542.60 = 218.53/x
  3. Step 3: Cross multiply
    393.19x = 542.60 × 218.53
  4. Step 4: Simplify right side
    393.19x = 118,574.78
  5. Step 5: Solve for x
    x = 118,574.78/393.19
  6. Step 6: Final answer
    x = 301.57

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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.