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Finding the Fourth Proportional to 157.08, 235.20 and 128.16

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Solution

The fourth proportional to 157.08, 235.20 and 128.16 is: 191.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.08 : 235.20 = 128.16 : x
  2. Step 2: Convert to fraction form
    157.08/235.20 = 128.16/x
  3. Step 3: Cross multiply
    157.08x = 235.20 × 128.16
  4. Step 4: Simplify right side
    157.08x = 30,143.23
  5. Step 5: Solve for x
    x = 30,143.23/157.08
  6. Step 6: Final answer
    x = 191.90

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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.