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Finding the Fourth Proportional to 40.64, 56.12 and 34.56

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Solution

The fourth proportional to 40.64, 56.12 and 34.56 is: 47.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.64 : 56.12 = 34.56 : x
  2. Step 2: Convert to fraction form
    40.64/56.12 = 34.56/x
  3. Step 3: Cross multiply
    40.64x = 56.12 × 34.56
  4. Step 4: Simplify right side
    40.64x = 1,939.51
  5. Step 5: Solve for x
    x = 1,939.51/40.64
  6. Step 6: Final answer
    x = 47.72

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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.