Home / 31,398.80-43,342.70-18,821.12

Finding the Fourth Proportional to 31,398.80, 43,342.70 and 18,821.12

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Solution

The fourth proportional to 31,398.80, 43,342.70 and 18,821.12 is: 25,980.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,398.80 : 43,342.70 = 18,821.12 : x
  2. Step 2: Convert to fraction form
    31,398.80/43,342.70 = 18,821.12/x
  3. Step 3: Cross multiply
    31,398.80x = 43,342.70 × 18,821.12
  4. Step 4: Simplify right side
    31,398.80x = 815,758,157.82
  5. Step 5: Solve for x
    x = 815,758,157.82/31,398.80
  6. Step 6: Final answer
    x = 25,980.55

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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.