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Finding the Fourth Proportional to 28,219.65, 38,943.17 and 15,644.40

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Solution

The fourth proportional to 28,219.65, 38,943.17 and 15,644.40 is: 21,589.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,219.65 : 38,943.17 = 15,644.40 : x
  2. Step 2: Convert to fraction form
    28,219.65/38,943.17 = 15,644.40/x
  3. Step 3: Cross multiply
    28,219.65x = 38,943.17 × 15,644.40
  4. Step 4: Simplify right side
    28,219.65x = 609,242,528.75
  5. Step 5: Solve for x
    x = 609,242,528.75/28,219.65
  6. Step 6: Final answer
    x = 21,589.30

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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.