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Finding the Fourth Proportional to 261, 389.46 and 236.76

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Solution

The fourth proportional to 261, 389.46 and 236.76 is: 353.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    261 : 389.46 = 236.76 : x
  2. Step 2: Convert to fraction form
    261/389.46 = 236.76/x
  3. Step 3: Cross multiply
    261x = 389.46 × 236.76
  4. Step 4: Simplify right side
    261x = 92,208.55
  5. Step 5: Solve for x
    x = 92,208.55/261
  6. Step 6: Final answer
    x = 353.29

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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.