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Finding the Fourth Proportional to 128.16, 176.64 and 117.92

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Solution

The fourth proportional to 128.16, 176.64 and 117.92 is: 162.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.16 : 176.64 = 117.92 : x
  2. Step 2: Convert to fraction form
    128.16/176.64 = 117.92/x
  3. Step 3: Cross multiply
    128.16x = 176.64 × 117.92
  4. Step 4: Simplify right side
    128.16x = 20,829.39
  5. Step 5: Solve for x
    x = 20,829.39/128.16
  6. Step 6: Final answer
    x = 162.53

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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.