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Finding the Fourth Proportional to 128.16, 177.24 and 112.60

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Solution

The fourth proportional to 128.16, 177.24 and 112.60 is: 155.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.16 : 177.24 = 112.60 : x
  2. Step 2: Convert to fraction form
    128.16/177.24 = 112.60/x
  3. Step 3: Cross multiply
    128.16x = 177.24 × 112.60
  4. Step 4: Simplify right side
    128.16x = 19,957.22
  5. Step 5: Solve for x
    x = 19,957.22/128.16
  6. Step 6: Final answer
    x = 155.72

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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.