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Finding the Fourth Proportional to 45.81, 63.20 and 26.40

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Solution

The fourth proportional to 45.81, 63.20 and 26.40 is: 36.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.81 : 63.20 = 26.40 : x
  2. Step 2: Convert to fraction form
    45.81/63.20 = 26.40/x
  3. Step 3: Cross multiply
    45.81x = 63.20 × 26.40
  4. Step 4: Simplify right side
    45.81x = 1,668.48
  5. Step 5: Solve for x
    x = 1,668.48/45.81
  6. Step 6: Final answer
    x = 36.42

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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.