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Finding the Fourth Proportional to 21.25, 29.34 and 14.77

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Solution

The fourth proportional to 21.25, 29.34 and 14.77 is: 20.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.25 : 29.34 = 14.77 : x
  2. Step 2: Convert to fraction form
    21.25/29.34 = 14.77/x
  3. Step 3: Cross multiply
    21.25x = 29.34 × 14.77
  4. Step 4: Simplify right side
    21.25x = 433.35
  5. Step 5: Solve for x
    x = 433.35/21.25
  6. Step 6: Final answer
    x = 20.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.