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Finding the Fourth Proportional to 21.58, 32.53 and 19.64

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Solution

The fourth proportional to 21.58, 32.53 and 19.64 is: 29.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.58 : 32.53 = 19.64 : x
  2. Step 2: Convert to fraction form
    21.58/32.53 = 19.64/x
  3. Step 3: Cross multiply
    21.58x = 32.53 × 19.64
  4. Step 4: Simplify right side
    21.58x = 638.89
  5. Step 5: Solve for x
    x = 638.89/21.58
  6. Step 6: Final answer
    x = 29.61

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.