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Finding the Fourth Proportional to 156.48, 216 and 115.20

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Solution

The fourth proportional to 156.48, 216 and 115.20 is: 159.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.48 : 216 = 115.20 : x
  2. Step 2: Convert to fraction form
    156.48/216 = 115.20/x
  3. Step 3: Cross multiply
    156.48x = 216 × 115.20
  4. Step 4: Simplify right side
    156.48x = 24,883.20
  5. Step 5: Solve for x
    x = 24,883.20/156.48
  6. Step 6: Final answer
    x = 159.02

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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.