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Finding the Fourth Proportional to 261.26, 389.48 and 240.71

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Solution

The fourth proportional to 261.26, 389.48 and 240.71 is: 358.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.26 : 389.48 = 240.71 : x
  2. Step 2: Convert to fraction form
    261.26/389.48 = 240.71/x
  3. Step 3: Cross multiply
    261.26x = 389.48 × 240.71
  4. Step 4: Simplify right side
    261.26x = 93,750.39
  5. Step 5: Solve for x
    x = 93,750.39/261.26
  6. Step 6: Final answer
    x = 358.85

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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.