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Finding the Fourth Proportional to 261.64, 360.90 and 239.56

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Solution

The fourth proportional to 261.64, 360.90 and 239.56 is: 330.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.64 : 360.90 = 239.56 : x
  2. Step 2: Convert to fraction form
    261.64/360.90 = 239.56/x
  3. Step 3: Cross multiply
    261.64x = 360.90 × 239.56
  4. Step 4: Simplify right side
    261.64x = 86,457.20
  5. Step 5: Solve for x
    x = 86,457.20/261.64
  6. Step 6: Final answer
    x = 330.44

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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.