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Finding the Fourth Proportional to 201.58, 278.15 and 117.53

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Solution

The fourth proportional to 201.58, 278.15 and 117.53 is: 162.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.58 : 278.15 = 117.53 : x
  2. Step 2: Convert to fraction form
    201.58/278.15 = 117.53/x
  3. Step 3: Cross multiply
    201.58x = 278.15 × 117.53
  4. Step 4: Simplify right side
    201.58x = 32,691.96
  5. Step 5: Solve for x
    x = 32,691.96/201.58
  6. Step 6: Final answer
    x = 162.18

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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.