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Finding the Fourth Proportional to 176.71, 265.19 and 85.43

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Solution

The fourth proportional to 176.71, 265.19 and 85.43 is: 128.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    176.71 : 265.19 = 85.43 : x
  2. Step 2: Convert to fraction form
    176.71/265.19 = 85.43/x
  3. Step 3: Cross multiply
    176.71x = 265.19 × 85.43
  4. Step 4: Simplify right side
    176.71x = 22,655.18
  5. Step 5: Solve for x
    x = 22,655.18/176.71
  6. Step 6: Final answer
    x = 128.21

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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.