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Finding the Fourth Proportional to 28,249.92, 38,985.12 and 15,674.88

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Solution

The fourth proportional to 28,249.92, 38,985.12 and 15,674.88 is: 21,631.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,249.92 : 38,985.12 = 15,674.88 : x
  2. Step 2: Convert to fraction form
    28,249.92/38,985.12 = 15,674.88/x
  3. Step 3: Cross multiply
    28,249.92x = 38,985.12 × 15,674.88
  4. Step 4: Simplify right side
    28,249.92x = 611,087,077.79
  5. Step 5: Solve for x
    x = 611,087,077.79/28,249.92
  6. Step 6: Final answer
    x = 21,631.46

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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.