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Finding the Fourth Proportional to 157.56, 217.74 and 128.00

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Solution

The fourth proportional to 157.56, 217.74 and 128.00 is: 176.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.56 : 217.74 = 128.00 : x
  2. Step 2: Convert to fraction form
    157.56/217.74 = 128.00/x
  3. Step 3: Cross multiply
    157.56x = 217.74 × 128.00
  4. Step 4: Simplify right side
    157.56x = 27,869.63
  5. Step 5: Solve for x
    x = 27,869.63/157.56
  6. Step 6: Final answer
    x = 176.88

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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.