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Finding the Fourth Proportional to 128.16, 176.40 and 106.08

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Solution

The fourth proportional to 128.16, 176.40 and 106.08 is: 146.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.16 : 176.40 = 106.08 : x
  2. Step 2: Convert to fraction form
    128.16/176.40 = 106.08/x
  3. Step 3: Cross multiply
    128.16x = 176.40 × 106.08
  4. Step 4: Simplify right side
    128.16x = 18,712.51
  5. Step 5: Solve for x
    x = 18,712.51/128.16
  6. Step 6: Final answer
    x = 146.01

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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.