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Finding the Fourth Proportional to 393.44, 542.93 and 218.77

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Solution

The fourth proportional to 393.44, 542.93 and 218.77 is: 301.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.44 : 542.93 = 218.77 : x
  2. Step 2: Convert to fraction form
    393.44/542.93 = 218.77/x
  3. Step 3: Cross multiply
    393.44x = 542.93 × 218.77
  4. Step 4: Simplify right side
    393.44x = 118,774.34
  5. Step 5: Solve for x
    x = 118,774.34/393.44
  6. Step 6: Final answer
    x = 301.89

Related Problems

Find fourth proportional to 196.72, 271.46 and 109.38
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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.