Home / 31,439.12-43,390.23-28,781.78

Finding the Fourth Proportional to 31,439.12, 43,390.23 and 28,781.78

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Solution

The fourth proportional to 31,439.12, 43,390.23 and 28,781.78 is: 39,722.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,439.12 : 43,390.23 = 28,781.78 : x
  2. Step 2: Convert to fraction form
    31,439.12/43,390.23 = 28,781.78/x
  3. Step 3: Cross multiply
    31,439.12x = 43,390.23 × 28,781.78
  4. Step 4: Simplify right side
    31,439.12x = 1,248,848,054.01
  5. Step 5: Solve for x
    x = 1,248,848,054.01/31,439.12
  6. Step 6: Final answer
    x = 39,722.74

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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.