Home / 20,431.56-30,649.11-5,640.48

Finding the Fourth Proportional to 20,431.56, 30,649.11 and 5,640.48

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Solution

The fourth proportional to 20,431.56, 30,649.11 and 5,640.48 is: 8,461.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,431.56 : 30,649.11 = 5,640.48 : x
  2. Step 2: Convert to fraction form
    20,431.56/30,649.11 = 5,640.48/x
  3. Step 3: Cross multiply
    20,431.56x = 30,649.11 × 5,640.48
  4. Step 4: Simplify right side
    20,431.56x = 172,875,702.08
  5. Step 5: Solve for x
    x = 172,875,702.08/20,431.56
  6. Step 6: Final answer
    x = 8,461.21

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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.