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Finding the Fourth Proportional to 40, 55.12 and 31.36

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Solution

The fourth proportional to 40, 55.12 and 31.36 is: 43.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    40 : 55.12 = 31.36 : x
  2. Step 2: Convert to fraction form
    40/55.12 = 31.36/x
  3. Step 3: Cross multiply
    40x = 55.12 × 31.36
  4. Step 4: Simplify right side
    40x = 1,728.56
  5. Step 5: Solve for x
    x = 1,728.56/40
  6. Step 6: Final answer
    x = 43.21

Related Problems

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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.