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Finding the Fourth Proportional to 28.60, 43.13 and 25.40

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Solution

The fourth proportional to 28.60, 43.13 and 25.40 is: 38.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.60 : 43.13 = 25.40 : x
  2. Step 2: Convert to fraction form
    28.60/43.13 = 25.40/x
  3. Step 3: Cross multiply
    28.60x = 43.13 × 25.40
  4. Step 4: Simplify right side
    28.60x = 1,095.50
  5. Step 5: Solve for x
    x = 1,095.50/28.60
  6. Step 6: Final answer
    x = 38.30

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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.