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Finding the Fourth Proportional to 28,246.49, 38,978.84 and 15,499.39

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Solution

The fourth proportional to 28,246.49, 38,978.84 and 15,499.39 is: 21,388.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,246.49 : 38,978.84 = 15,499.39 : x
  2. Step 2: Convert to fraction form
    28,246.49/38,978.84 = 15,499.39/x
  3. Step 3: Cross multiply
    28,246.49x = 38,978.84 × 15,499.39
  4. Step 4: Simplify right side
    28,246.49x = 604,147,970.52
  5. Step 5: Solve for x
    x = 604,147,970.52/28,246.49
  6. Step 6: Final answer
    x = 21,388.43

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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.