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Finding the Fourth Proportional to 101.48, 139.72 and 85.04

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Solution

The fourth proportional to 101.48, 139.72 and 85.04 is: 117.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.48 : 139.72 = 85.04 : x
  2. Step 2: Convert to fraction form
    101.48/139.72 = 85.04/x
  3. Step 3: Cross multiply
    101.48x = 139.72 × 85.04
  4. Step 4: Simplify right side
    101.48x = 11,881.79
  5. Step 5: Solve for x
    x = 11,881.79/101.48
  6. Step 6: Final answer
    x = 117.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.