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Finding the Fourth Proportional to 28.58, 39.20 and 28.35

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Solution

The fourth proportional to 28.58, 39.20 and 28.35 is: 38.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.58 : 39.20 = 28.35 : x
  2. Step 2: Convert to fraction form
    28.58/39.20 = 28.35/x
  3. Step 3: Cross multiply
    28.58x = 39.20 × 28.35
  4. Step 4: Simplify right side
    28.58x = 1,111.18
  5. Step 5: Solve for x
    x = 1,111.18/28.58
  6. Step 6: Final answer
    x = 38.89

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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.