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Finding the Fourth Proportional to 261.54, 360.89 and 156.61

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Solution

The fourth proportional to 261.54, 360.89 and 156.61 is: 216.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.54 : 360.89 = 156.61 : x
  2. Step 2: Convert to fraction form
    261.54/360.89 = 156.61/x
  3. Step 3: Cross multiply
    261.54x = 360.89 × 156.61
  4. Step 4: Simplify right side
    261.54x = 56,518.66
  5. Step 5: Solve for x
    x = 56,518.66/261.54
  6. Step 6: Final answer
    x = 216.10

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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.