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Finding the Fourth Proportional to 40.76, 56.21 and 28.48

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Solution

The fourth proportional to 40.76, 56.21 and 28.48 is: 39.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.76 : 56.21 = 28.48 : x
  2. Step 2: Convert to fraction form
    40.76/56.21 = 28.48/x
  3. Step 3: Cross multiply
    40.76x = 56.21 × 28.48
  4. Step 4: Simplify right side
    40.76x = 1,600.79
  5. Step 5: Solve for x
    x = 1,600.79/40.76
  6. Step 6: Final answer
    x = 39.27

Related Problems

Find fourth proportional to 20.38, 28.11 and 14.24
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1.5x scale

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.