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Finding the Fourth Proportional to 28,439.88, 42,645.76 and 8,713.68

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Solution

The fourth proportional to 28,439.88, 42,645.76 and 8,713.68 is: 13,066.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,439.88 : 42,645.76 = 8,713.68 : x
  2. Step 2: Convert to fraction form
    28,439.88/42,645.76 = 8,713.68/x
  3. Step 3: Cross multiply
    28,439.88x = 42,645.76 × 8,713.68
  4. Step 4: Simplify right side
    28,439.88x = 371,601,506.00
  5. Step 5: Solve for x
    x = 371,601,506.00/28,439.88
  6. Step 6: Final answer
    x = 13,066.21

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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.