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Finding the Fourth Proportional to 31.00, 46.48 and 21.39

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Solution

The fourth proportional to 31.00, 46.48 and 21.39 is: 32.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.00 : 46.48 = 21.39 : x
  2. Step 2: Convert to fraction form
    31.00/46.48 = 21.39/x
  3. Step 3: Cross multiply
    31.00x = 46.48 × 21.39
  4. Step 4: Simplify right side
    31.00x = 994.32
  5. Step 5: Solve for x
    x = 994.32/31.00
  6. Step 6: Final answer
    x = 32.07

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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.