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Finding the Fourth Proportional to 156.15, 233.96 and 128.88

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Solution

The fourth proportional to 156.15, 233.96 and 128.88 is: 193.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.15 : 233.96 = 128.88 : x
  2. Step 2: Convert to fraction form
    156.15/233.96 = 128.88/x
  3. Step 3: Cross multiply
    156.15x = 233.96 × 128.88
  4. Step 4: Simplify right side
    156.15x = 30,152.12
  5. Step 5: Solve for x
    x = 30,152.12/156.15
  6. Step 6: Final answer
    x = 193.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.