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Finding the Fourth Proportional to 20,635, 28,479.90 and 12,251.32

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Solution

The fourth proportional to 20,635, 28,479.90 and 12,251.32 is: 16,908.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,635 : 28,479.90 = 12,251.32 : x
  2. Step 2: Convert to fraction form
    20,635/28,479.90 = 12,251.32/x
  3. Step 3: Cross multiply
    20,635x = 28,479.90 × 12,251.32
  4. Step 4: Simplify right side
    20,635x = 348,916,368.47
  5. Step 5: Solve for x
    x = 348,916,368.47/20,635
  6. Step 6: Final answer
    x = 16,908.96

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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.