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Finding the Fourth Proportional to 31,178.70, 43,040.76 and 19,863.71

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Solution

The fourth proportional to 31,178.70, 43,040.76 and 19,863.71 is: 27,420.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,178.70 : 43,040.76 = 19,863.71 : x
  2. Step 2: Convert to fraction form
    31,178.70/43,040.76 = 19,863.71/x
  3. Step 3: Cross multiply
    31,178.70x = 43,040.76 × 19,863.71
  4. Step 4: Simplify right side
    31,178.70x = 854,949,174.82
  5. Step 5: Solve for x
    x = 854,949,174.82/31,178.70
  6. Step 6: Final answer
    x = 27,420.94

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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.