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Finding the Fourth Proportional to 39.09, 58.60 and 28.25

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Solution

The fourth proportional to 39.09, 58.60 and 28.25 is: 42.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.09 : 58.60 = 28.25 : x
  2. Step 2: Convert to fraction form
    39.09/58.60 = 28.25/x
  3. Step 3: Cross multiply
    39.09x = 58.60 × 28.25
  4. Step 4: Simplify right side
    39.09x = 1,655.45
  5. Step 5: Solve for x
    x = 1,655.45/39.09
  6. Step 6: Final answer
    x = 42.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.