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Finding the Fourth Proportional to 131.04, 181.56 and 128.16

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Solution

The fourth proportional to 131.04, 181.56 and 128.16 is: 177.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.04 : 181.56 = 128.16 : x
  2. Step 2: Convert to fraction form
    131.04/181.56 = 128.16/x
  3. Step 3: Cross multiply
    131.04x = 181.56 × 128.16
  4. Step 4: Simplify right side
    131.04x = 23,268.73
  5. Step 5: Solve for x
    x = 23,268.73/131.04
  6. Step 6: Final answer
    x = 177.57

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.