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Finding the Fourth Proportional to 39.40, 53.90 and 39.22

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Solution

The fourth proportional to 39.40, 53.90 and 39.22 is: 53.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.40 : 53.90 = 39.22 : x
  2. Step 2: Convert to fraction form
    39.40/53.90 = 39.22/x
  3. Step 3: Cross multiply
    39.40x = 53.90 × 39.22
  4. Step 4: Simplify right side
    39.40x = 2,113.96
  5. Step 5: Solve for x
    x = 2,113.96/39.40
  6. Step 6: Final answer
    x = 53.65

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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.