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Finding the Fourth Proportional to 28,659.87, 39,551.85 and 15,913.05

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Solution

The fourth proportional to 28,659.87, 39,551.85 and 15,913.05 is: 21,960.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,659.87 : 39,551.85 = 15,913.05 : x
  2. Step 2: Convert to fraction form
    28,659.87/39,551.85 = 15,913.05/x
  3. Step 3: Cross multiply
    28,659.87x = 39,551.85 × 15,913.05
  4. Step 4: Simplify right side
    28,659.87x = 629,390,566.64
  5. Step 5: Solve for x
    x = 629,390,566.64/28,659.87
  6. Step 6: Final answer
    x = 21,960.69

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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.