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Finding the Fourth Proportional to 28,235.96, 38,965.65 and 15,660.71

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Solution

The fourth proportional to 28,235.96, 38,965.65 and 15,660.71 is: 21,611.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,235.96 : 38,965.65 = 15,660.71 : x
  2. Step 2: Convert to fraction form
    28,235.96/38,965.65 = 15,660.71/x
  3. Step 3: Cross multiply
    28,235.96x = 38,965.65 × 15,660.71
  4. Step 4: Simplify right side
    28,235.96x = 610,229,637.18
  5. Step 5: Solve for x
    x = 610,229,637.18/28,235.96
  6. Step 6: Final answer
    x = 21,611.79

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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.