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Finding the Fourth Proportional to 147.39, 203.39 and 85.21

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Solution

The fourth proportional to 147.39, 203.39 and 85.21 is: 117.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.39 : 203.39 = 85.21 : x
  2. Step 2: Convert to fraction form
    147.39/203.39 = 85.21/x
  3. Step 3: Cross multiply
    147.39x = 203.39 × 85.21
  4. Step 4: Simplify right side
    147.39x = 17,329.93
  5. Step 5: Solve for x
    x = 17,329.93/147.39
  6. Step 6: Final answer
    x = 117.58

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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.