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Finding the Fourth Proportional to 28.64, 43.12 and 26.40

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Solution

The fourth proportional to 28.64, 43.12 and 26.40 is: 39.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.64 : 43.12 = 26.40 : x
  2. Step 2: Convert to fraction form
    28.64/43.12 = 26.40/x
  3. Step 3: Cross multiply
    28.64x = 43.12 × 26.40
  4. Step 4: Simplify right side
    28.64x = 1,138.37
  5. Step 5: Solve for x
    x = 1,138.37/28.64
  6. Step 6: Final answer
    x = 39.75

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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.