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Finding the Fourth Proportional to 28,187.56, 38,898.50 and 15,612.20

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Solution

The fourth proportional to 28,187.56, 38,898.50 and 15,612.20 is: 21,544.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,187.56 : 38,898.50 = 15,612.20 : x
  2. Step 2: Convert to fraction form
    28,187.56/38,898.50 = 15,612.20/x
  3. Step 3: Cross multiply
    28,187.56x = 38,898.50 × 15,612.20
  4. Step 4: Simplify right side
    28,187.56x = 607,291,161.70
  5. Step 5: Solve for x
    x = 607,291,161.70/28,187.56
  6. Step 6: Final answer
    x = 21,544.65

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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.