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Finding the Fourth Proportional to 261.55, 389.59 and 249.70

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Solution

The fourth proportional to 261.55, 389.59 and 249.70 is: 371.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.55 : 389.59 = 249.70 : x
  2. Step 2: Convert to fraction form
    261.55/389.59 = 249.70/x
  3. Step 3: Cross multiply
    261.55x = 389.59 × 249.70
  4. Step 4: Simplify right side
    261.55x = 97,279.37
  5. Step 5: Solve for x
    x = 97,279.37/261.55
  6. Step 6: Final answer
    x = 371.93

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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.