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Finding the Fourth Proportional to 31.55, 47.33 and 18.02

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Solution

The fourth proportional to 31.55, 47.33 and 18.02 is: 27.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.55 : 47.33 = 18.02 : x
  2. Step 2: Convert to fraction form
    31.55/47.33 = 18.02/x
  3. Step 3: Cross multiply
    31.55x = 47.33 × 18.02
  4. Step 4: Simplify right side
    31.55x = 852.87
  5. Step 5: Solve for x
    x = 852.87/31.55
  6. Step 6: Final answer
    x = 27.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.