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Finding the Fourth Proportional to 156.64, 216.12 and 101.38

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Solution

The fourth proportional to 156.64, 216.12 and 101.38 is: 139.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.64 : 216.12 = 101.38 : x
  2. Step 2: Convert to fraction form
    156.64/216.12 = 101.38/x
  3. Step 3: Cross multiply
    156.64x = 216.12 × 101.38
  4. Step 4: Simplify right side
    156.64x = 21,910.25
  5. Step 5: Solve for x
    x = 21,910.25/156.64
  6. Step 6: Final answer
    x = 139.88

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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.