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Finding the Fourth Proportional to 21.34, 31.98 and 10.62

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Solution

The fourth proportional to 21.34, 31.98 and 10.62 is: 15.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.34 : 31.98 = 10.62 : x
  2. Step 2: Convert to fraction form
    21.34/31.98 = 10.62/x
  3. Step 3: Cross multiply
    21.34x = 31.98 × 10.62
  4. Step 4: Simplify right side
    21.34x = 339.63
  5. Step 5: Solve for x
    x = 339.63/21.34
  6. Step 6: Final answer
    x = 15.92

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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.