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Finding the Fourth Proportional to 28.58, 39.71 and 28.13

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Solution

The fourth proportional to 28.58, 39.71 and 28.13 is: 39.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.58 : 39.71 = 28.13 : x
  2. Step 2: Convert to fraction form
    28.58/39.71 = 28.13/x
  3. Step 3: Cross multiply
    28.58x = 39.71 × 28.13
  4. Step 4: Simplify right side
    28.58x = 1,117.04
  5. Step 5: Solve for x
    x = 1,117.04/28.58
  6. Step 6: Final answer
    x = 39.08

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.