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Finding the Fourth Proportional to 39, 53.89 and 30.25

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Solution

The fourth proportional to 39, 53.89 and 30.25 is: 41.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    39 : 53.89 = 30.25 : x
  2. Step 2: Convert to fraction form
    39/53.89 = 30.25/x
  3. Step 3: Cross multiply
    39x = 53.89 × 30.25
  4. Step 4: Simplify right side
    39x = 1,630.17
  5. Step 5: Solve for x
    x = 1,630.17/39
  6. Step 6: Final answer
    x = 41.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.