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Finding the Fourth Proportional to 378.10, 521.82 and 220.75

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Solution

The fourth proportional to 378.10, 521.82 and 220.75 is: 304.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.10 : 521.82 = 220.75 : x
  2. Step 2: Convert to fraction form
    378.10/521.82 = 220.75/x
  3. Step 3: Cross multiply
    378.10x = 521.82 × 220.75
  4. Step 4: Simplify right side
    378.10x = 115,191.77
  5. Step 5: Solve for x
    x = 115,191.77/378.10
  6. Step 6: Final answer
    x = 304.66

Related Problems

Find fourth proportional to 189.05, 260.91 and 110.38
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Double scale
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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.