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Finding the Fourth Proportional to 128.61, 176.75 and 116.04

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Solution

The fourth proportional to 128.61, 176.75 and 116.04 is: 159.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.61 : 176.75 = 116.04 : x
  2. Step 2: Convert to fraction form
    128.61/176.75 = 116.04/x
  3. Step 3: Cross multiply
    128.61x = 176.75 × 116.04
  4. Step 4: Simplify right side
    128.61x = 20,509.49
  5. Step 5: Solve for x
    x = 20,509.49/128.61
  6. Step 6: Final answer
    x = 159.47

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.