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Finding the Fourth Proportional to 37.99, 56.99 and 20.88

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Solution

The fourth proportional to 37.99, 56.99 and 20.88 is: 31.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    37.99 : 56.99 = 20.88 : x
  2. Step 2: Convert to fraction form
    37.99/56.99 = 20.88/x
  3. Step 3: Cross multiply
    37.99x = 56.99 × 20.88
  4. Step 4: Simplify right side
    37.99x = 1,189.79
  5. Step 5: Solve for x
    x = 1,189.79/37.99
  6. Step 6: Final answer
    x = 31.32

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1.5x scale

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.