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Finding the Fourth Proportional to 28,415.75, 42,643.07 and 9,947.75

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Solution

The fourth proportional to 28,415.75, 42,643.07 and 9,947.75 is: 14,928.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,415.75 : 42,643.07 = 9,947.75 : x
  2. Step 2: Convert to fraction form
    28,415.75/42,643.07 = 9,947.75/x
  3. Step 3: Cross multiply
    28,415.75x = 42,643.07 × 9,947.75
  4. Step 4: Simplify right side
    28,415.75x = 424,202,599.59
  5. Step 5: Solve for x
    x = 424,202,599.59/28,415.75
  6. Step 6: Final answer
    x = 14,928.43

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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.