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Finding the Fourth Proportional to 37.79, 56.72 and 19.77

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Solution

The fourth proportional to 37.79, 56.72 and 19.77 is: 29.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    37.79 : 56.72 = 19.77 : x
  2. Step 2: Convert to fraction form
    37.79/56.72 = 19.77/x
  3. Step 3: Cross multiply
    37.79x = 56.72 × 19.77
  4. Step 4: Simplify right side
    37.79x = 1,121.08
  5. Step 5: Solve for x
    x = 1,121.08/37.79
  6. Step 6: Final answer
    x = 29.67

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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.