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Finding the Fourth Proportional to 118.03, 162.78 and 85.30

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Solution

The fourth proportional to 118.03, 162.78 and 85.30 is: 117.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.03 : 162.78 = 85.30 : x
  2. Step 2: Convert to fraction form
    118.03/162.78 = 85.30/x
  3. Step 3: Cross multiply
    118.03x = 162.78 × 85.30
  4. Step 4: Simplify right side
    118.03x = 13,885.13
  5. Step 5: Solve for x
    x = 13,885.13/118.03
  6. Step 6: Final answer
    x = 117.64

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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.