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Finding the Fourth Proportional to 261.98, 390.76 and 227.47

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Solution

The fourth proportional to 261.98, 390.76 and 227.47 is: 339.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.98 : 390.76 = 227.47 : x
  2. Step 2: Convert to fraction form
    261.98/390.76 = 227.47/x
  3. Step 3: Cross multiply
    261.98x = 390.76 × 227.47
  4. Step 4: Simplify right side
    261.98x = 88,886.18
  5. Step 5: Solve for x
    x = 88,886.18/261.98
  6. Step 6: Final answer
    x = 339.29

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.