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Finding the Fourth Proportional to 147.71, 203.84 and 85.55

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Solution

The fourth proportional to 147.71, 203.84 and 85.55 is: 118.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.71 : 203.84 = 85.55 : x
  2. Step 2: Convert to fraction form
    147.71/203.84 = 85.55/x
  3. Step 3: Cross multiply
    147.71x = 203.84 × 85.55
  4. Step 4: Simplify right side
    147.71x = 17,437.07
  5. Step 5: Solve for x
    x = 17,437.07/147.71
  6. Step 6: Final answer
    x = 118.05

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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.