Home / 31,543.21-47,218.21-20,427.78

Finding the Fourth Proportional to 31,543.21, 47,218.21 and 20,427.78

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Solution

The fourth proportional to 31,543.21, 47,218.21 and 20,427.78 is: 30,579.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,543.21 : 47,218.21 = 20,427.78 : x
  2. Step 2: Convert to fraction form
    31,543.21/47,218.21 = 20,427.78/x
  3. Step 3: Cross multiply
    31,543.21x = 47,218.21 × 20,427.78
  4. Step 4: Simplify right side
    31,543.21x = 964,563,331.87
  5. Step 5: Solve for x
    x = 964,563,331.87/31,543.21
  6. Step 6: Final answer
    x = 30,579.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.