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Finding the Fourth Proportional to 21.02, 31.52 and 9.60

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Solution

The fourth proportional to 21.02, 31.52 and 9.60 is: 14.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.02 : 31.52 = 9.60 : x
  2. Step 2: Convert to fraction form
    21.02/31.52 = 9.60/x
  3. Step 3: Cross multiply
    21.02x = 31.52 × 9.60
  4. Step 4: Simplify right side
    21.02x = 302.50
  5. Step 5: Solve for x
    x = 302.50/21.02
  6. Step 6: Final answer
    x = 14.39

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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.