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Finding the Fourth Proportional to 21.83, 32.45 and 21.51

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Solution

The fourth proportional to 21.83, 32.45 and 21.51 is: 31.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.83 : 32.45 = 21.51 : x
  2. Step 2: Convert to fraction form
    21.83/32.45 = 21.51/x
  3. Step 3: Cross multiply
    21.83x = 32.45 × 21.51
  4. Step 4: Simplify right side
    21.83x = 697.89
  5. Step 5: Solve for x
    x = 697.89/21.83
  6. Step 6: Final answer
    x = 31.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.