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Finding the Fourth Proportional to 156.88, 216.52 and 131.28

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Solution

The fourth proportional to 156.88, 216.52 and 131.28 is: 181.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.88 : 216.52 = 131.28 : x
  2. Step 2: Convert to fraction form
    156.88/216.52 = 131.28/x
  3. Step 3: Cross multiply
    156.88x = 216.52 × 131.28
  4. Step 4: Simplify right side
    156.88x = 28,424.75
  5. Step 5: Solve for x
    x = 28,424.75/156.88
  6. Step 6: Final answer
    x = 181.19

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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.