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Finding the Fourth Proportional to 28,245.99, 38,978.13 and 15,498.90

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Solution

The fourth proportional to 28,245.99, 38,978.13 and 15,498.90 is: 21,387.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,245.99 : 38,978.13 = 15,498.90 : x
  2. Step 2: Convert to fraction form
    28,245.99/38,978.13 = 15,498.90/x
  3. Step 3: Cross multiply
    28,245.99x = 38,978.13 × 15,498.90
  4. Step 4: Simplify right side
    28,245.99x = 604,118,139.06
  5. Step 5: Solve for x
    x = 604,118,139.06/28,245.99
  6. Step 6: Final answer
    x = 21,387.75

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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.