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Finding the Fourth Proportional to 378.14, 521.80 and 220.76

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Solution

The fourth proportional to 378.14, 521.80 and 220.76 is: 304.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.14 : 521.80 = 220.76 : x
  2. Step 2: Convert to fraction form
    378.14/521.80 = 220.76/x
  3. Step 3: Cross multiply
    378.14x = 521.80 × 220.76
  4. Step 4: Simplify right side
    378.14x = 115,192.57
  5. Step 5: Solve for x
    x = 115,192.57/378.14
  6. Step 6: Final answer
    x = 304.63

Related Problems

Find fourth proportional to 189.07, 260.90 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.