Home / 28,371.16-39,134.46-20,400.76

Finding the Fourth Proportional to 28,371.16, 39,134.46 and 20,400.76

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Solution

The fourth proportional to 28,371.16, 39,134.46 and 20,400.76 is: 28,140.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,371.16 : 39,134.46 = 20,400.76 : x
  2. Step 2: Convert to fraction form
    28,371.16/39,134.46 = 20,400.76/x
  3. Step 3: Cross multiply
    28,371.16x = 39,134.46 × 20,400.76
  4. Step 4: Simplify right side
    28,371.16x = 798,372,726.19
  5. Step 5: Solve for x
    x = 798,372,726.19/28,371.16
  6. Step 6: Final answer
    x = 28,140.29

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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.