Home / 28,218.90-38,942.13-15,643.65

Finding the Fourth Proportional to 28,218.90, 38,942.13 and 15,643.65

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Solution

The fourth proportional to 28,218.90, 38,942.13 and 15,643.65 is: 21,588.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,218.90 : 38,942.13 = 15,643.65 : x
  2. Step 2: Convert to fraction form
    28,218.90/38,942.13 = 15,643.65/x
  3. Step 3: Cross multiply
    28,218.90x = 38,942.13 × 15,643.65
  4. Step 4: Simplify right side
    28,218.90x = 609,196,857.26
  5. Step 5: Solve for x
    x = 609,196,857.26/28,218.90
  6. Step 6: Final answer
    x = 21,588.26

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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.