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Finding the Fourth Proportional to 38.70, 53.38 and 26.40

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Solution

The fourth proportional to 38.70, 53.38 and 26.40 is: 36.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.70 : 53.38 = 26.40 : x
  2. Step 2: Convert to fraction form
    38.70/53.38 = 26.40/x
  3. Step 3: Cross multiply
    38.70x = 53.38 × 26.40
  4. Step 4: Simplify right side
    38.70x = 1,409.23
  5. Step 5: Solve for x
    x = 1,409.23/38.70
  6. Step 6: Final answer
    x = 36.41

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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.