Home / 20,388.66-28,135.71-12,427.98

Finding the Fourth Proportional to 20,388.66, 28,135.71 and 12,427.98

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Solution

The fourth proportional to 20,388.66, 28,135.71 and 12,427.98 is: 17,150.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.66 : 28,135.71 = 12,427.98 : x
  2. Step 2: Convert to fraction form
    20,388.66/28,135.71 = 12,427.98/x
  3. Step 3: Cross multiply
    20,388.66x = 28,135.71 × 12,427.98
  4. Step 4: Simplify right side
    20,388.66x = 349,670,041.17
  5. Step 5: Solve for x
    x = 349,670,041.17/20,388.66
  6. Step 6: Final answer
    x = 17,150.22

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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.