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Finding the Fourth Proportional to 176.85, 265.05 and 128.70

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Solution

The fourth proportional to 176.85, 265.05 and 128.70 is: 192.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    176.85 : 265.05 = 128.70 : x
  2. Step 2: Convert to fraction form
    176.85/265.05 = 128.70/x
  3. Step 3: Cross multiply
    176.85x = 265.05 × 128.70
  4. Step 4: Simplify right side
    176.85x = 34,111.94
  5. Step 5: Solve for x
    x = 34,111.94/176.85
  6. Step 6: Final answer
    x = 192.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.