Home / 31,618.62-43,642.80-20,871.35

Finding the Fourth Proportional to 31,618.62, 43,642.80 and 20,871.35

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Solution

The fourth proportional to 31,618.62, 43,642.80 and 20,871.35 is: 28,808.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,618.62 : 43,642.80 = 20,871.35 : x
  2. Step 2: Convert to fraction form
    31,618.62/43,642.80 = 20,871.35/x
  3. Step 3: Cross multiply
    31,618.62x = 43,642.80 × 20,871.35
  4. Step 4: Simplify right side
    31,618.62x = 910,883,935.57
  5. Step 5: Solve for x
    x = 910,883,935.57/31,618.62
  6. Step 6: Final answer
    x = 28,808.47

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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.