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Finding the Fourth Proportional to 261.20, 360.30 and 157.68

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Solution

The fourth proportional to 261.20, 360.30 and 157.68 is: 217.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.20 : 360.30 = 157.68 : x
  2. Step 2: Convert to fraction form
    261.20/360.30 = 157.68/x
  3. Step 3: Cross multiply
    261.20x = 360.30 × 157.68
  4. Step 4: Simplify right side
    261.20x = 56,812.10
  5. Step 5: Solve for x
    x = 56,812.10/261.20
  6. Step 6: Final answer
    x = 217.50

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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.