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Finding the Fourth Proportional to 147.40, 203.41 and 85.22

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Solution

The fourth proportional to 147.40, 203.41 and 85.22 is: 117.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.40 : 203.41 = 85.22 : x
  2. Step 2: Convert to fraction form
    147.40/203.41 = 85.22/x
  3. Step 3: Cross multiply
    147.40x = 203.41 × 85.22
  4. Step 4: Simplify right side
    147.40x = 17,333.58
  5. Step 5: Solve for x
    x = 17,333.58/147.40
  6. Step 6: Final answer
    x = 117.60

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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.