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Finding the Fourth Proportional to 28,478.94, 42,722.48 and 8,759.15

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Solution

The fourth proportional to 28,478.94, 42,722.48 and 8,759.15 is: 13,139.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,478.94 : 42,722.48 = 8,759.15 : x
  2. Step 2: Convert to fraction form
    28,478.94/42,722.48 = 8,759.15/x
  3. Step 3: Cross multiply
    28,478.94x = 42,722.48 × 8,759.15
  4. Step 4: Simplify right side
    28,478.94x = 374,212,610.69
  5. Step 5: Solve for x
    x = 374,212,610.69/28,478.94
  6. Step 6: Final answer
    x = 13,139.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.