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Finding the Fourth Proportional to 176.61, 264.79 and 85.38

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Solution

The fourth proportional to 176.61, 264.79 and 85.38 is: 128.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    176.61 : 264.79 = 85.38 : x
  2. Step 2: Convert to fraction form
    176.61/264.79 = 85.38/x
  3. Step 3: Cross multiply
    176.61x = 264.79 × 85.38
  4. Step 4: Simplify right side
    176.61x = 22,607.56
  5. Step 5: Solve for x
    x = 22,607.56/176.61
  6. Step 6: Final answer
    x = 128.01

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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.