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Finding the Fourth Proportional to 40.37, 56.09 and 39.70

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Solution

The fourth proportional to 40.37, 56.09 and 39.70 is: 55.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.37 : 56.09 = 39.70 : x
  2. Step 2: Convert to fraction form
    40.37/56.09 = 39.70/x
  3. Step 3: Cross multiply
    40.37x = 56.09 × 39.70
  4. Step 4: Simplify right side
    40.37x = 2,226.49
  5. Step 5: Solve for x
    x = 2,226.49/40.37
  6. Step 6: Final answer
    x = 55.15

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.