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Finding the Fourth Proportional to 21.57, 29.57 and 21.26

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Solution

The fourth proportional to 21.57, 29.57 and 21.26 is: 29.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.57 : 29.57 = 21.26 : x
  2. Step 2: Convert to fraction form
    21.57/29.57 = 21.26/x
  3. Step 3: Cross multiply
    21.57x = 29.57 × 21.26
  4. Step 4: Simplify right side
    21.57x = 628.63
  5. Step 5: Solve for x
    x = 628.63/21.57
  6. Step 6: Final answer
    x = 29.15

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1.5x scale

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.