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Finding the Fourth Proportional to 261.80, 360.55 and 256.13

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Solution

The fourth proportional to 261.80, 360.55 and 256.13 is: 352.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.80 : 360.55 = 256.13 : x
  2. Step 2: Convert to fraction form
    261.80/360.55 = 256.13/x
  3. Step 3: Cross multiply
    261.80x = 360.55 × 256.13
  4. Step 4: Simplify right side
    261.80x = 92,347.67
  5. Step 5: Solve for x
    x = 92,347.67/261.80
  6. Step 6: Final answer
    x = 352.74

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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.