Home / 20,420.51-28,180.10-11,467.78

Finding the Fourth Proportional to 20,420.51, 28,180.10 and 11,467.78

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Solution

The fourth proportional to 20,420.51, 28,180.10 and 11,467.78 is: 15,825.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,420.51 : 28,180.10 = 11,467.78 : x
  2. Step 2: Convert to fraction form
    20,420.51/28,180.10 = 11,467.78/x
  3. Step 3: Cross multiply
    20,420.51x = 28,180.10 × 11,467.78
  4. Step 4: Simplify right side
    20,420.51x = 323,163,145.40
  5. Step 5: Solve for x
    x = 323,163,145.40/20,420.51
  6. Step 6: Final answer
    x = 15,825.42

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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.