Home / 20,428-28,202.16-15,451.36

Finding the Fourth Proportional to 20,428, 28,202.16 and 15,451.36

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Solution

The fourth proportional to 20,428, 28,202.16 and 15,451.36 is: 21,331.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,428 : 28,202.16 = 15,451.36 : x
  2. Step 2: Convert to fraction form
    20,428/28,202.16 = 15,451.36/x
  3. Step 3: Cross multiply
    20,428x = 28,202.16 × 15,451.36
  4. Step 4: Simplify right side
    20,428x = 435,761,726.94
  5. Step 5: Solve for x
    x = 435,761,726.94/20,428
  6. Step 6: Final answer
    x = 21,331.59

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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.