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Finding the Fourth Proportional to 21.86, 29.93 and 21.32

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Solution

The fourth proportional to 21.86, 29.93 and 21.32 is: 29.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.86 : 29.93 = 21.32 : x
  2. Step 2: Convert to fraction form
    21.86/29.93 = 21.32/x
  3. Step 3: Cross multiply
    21.86x = 29.93 × 21.32
  4. Step 4: Simplify right side
    21.86x = 638.00
  5. Step 5: Solve for x
    x = 638.00/21.86
  6. Step 6: Final answer
    x = 29.19

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.