Home / 28,221.12-38,943.84-15,645.60

Finding the Fourth Proportional to 28,221.12, 38,943.84 and 15,645.60

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Solution

The fourth proportional to 28,221.12, 38,943.84 and 15,645.60 is: 21,590.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,221.12 : 38,943.84 = 15,645.60 : x
  2. Step 2: Convert to fraction form
    28,221.12/38,943.84 = 15,645.60/x
  3. Step 3: Cross multiply
    28,221.12x = 38,943.84 × 15,645.60
  4. Step 4: Simplify right side
    28,221.12x = 609,299,743.10
  5. Step 5: Solve for x
    x = 609,299,743.10/28,221.12
  6. Step 6: Final answer
    x = 21,590.20

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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.