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Finding the Fourth Proportional to 85.29, 127.21 and 72.52

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Solution

The fourth proportional to 85.29, 127.21 and 72.52 is: 108.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.29 : 127.21 = 72.52 : x
  2. Step 2: Convert to fraction form
    85.29/127.21 = 72.52/x
  3. Step 3: Cross multiply
    85.29x = 127.21 × 72.52
  4. Step 4: Simplify right side
    85.29x = 9,225.27
  5. Step 5: Solve for x
    x = 9,225.27/85.29
  6. Step 6: Final answer
    x = 108.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.