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Finding the Fourth Proportional to 40.45, 55.70 and 31.13

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Solution

The fourth proportional to 40.45, 55.70 and 31.13 is: 42.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.45 : 55.70 = 31.13 : x
  2. Step 2: Convert to fraction form
    40.45/55.70 = 31.13/x
  3. Step 3: Cross multiply
    40.45x = 55.70 × 31.13
  4. Step 4: Simplify right side
    40.45x = 1,733.51
  5. Step 5: Solve for x
    x = 1,733.51/40.45
  6. Step 6: Final answer
    x = 42.86

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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.