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Finding the Fourth Proportional to 28,408.65, 42,612.96 and 8,687.21

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Solution

The fourth proportional to 28,408.65, 42,612.96 and 8,687.21 is: 13,030.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,408.65 : 42,612.96 = 8,687.21 : x
  2. Step 2: Convert to fraction form
    28,408.65/42,612.96 = 8,687.21/x
  3. Step 3: Cross multiply
    28,408.65x = 42,612.96 × 8,687.21
  4. Step 4: Simplify right side
    28,408.65x = 370,187,732.24
  5. Step 5: Solve for x
    x = 370,187,732.24/28,408.65
  6. Step 6: Final answer
    x = 13,030.81

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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.