Home / 28,218.88-38,943.36-15,643.52

Finding the Fourth Proportional to 28,218.88, 38,943.36 and 15,643.52

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Solution

The fourth proportional to 28,218.88, 38,943.36 and 15,643.52 is: 21,588.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,218.88 : 38,943.36 = 15,643.52 : x
  2. Step 2: Convert to fraction form
    28,218.88/38,943.36 = 15,643.52/x
  3. Step 3: Cross multiply
    28,218.88x = 38,943.36 × 15,643.52
  4. Step 4: Simplify right side
    28,218.88x = 609,211,231.03
  5. Step 5: Solve for x
    x = 609,211,231.03/28,218.88
  6. Step 6: Final answer
    x = 21,588.78

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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.