Home / 31,407.32-43,360.04-20,811.30

Finding the Fourth Proportional to 31,407.32, 43,360.04 and 20,811.30

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Solution

The fourth proportional to 31,407.32, 43,360.04 and 20,811.30 is: 28,731.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,407.32 : 43,360.04 = 20,811.30 : x
  2. Step 2: Convert to fraction form
    31,407.32/43,360.04 = 20,811.30/x
  3. Step 3: Cross multiply
    31,407.32x = 43,360.04 × 20,811.30
  4. Step 4: Simplify right side
    31,407.32x = 902,378,800.45
  5. Step 5: Solve for x
    x = 902,378,800.45/31,407.32
  6. Step 6: Final answer
    x = 28,731.48

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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.