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Finding the Fourth Proportional to 20,920.16, 28,881.03 and 16,129.64

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Solution

The fourth proportional to 20,920.16, 28,881.03 and 16,129.64 is: 22,267.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.16 : 28,881.03 = 16,129.64 : x
  2. Step 2: Convert to fraction form
    20,920.16/28,881.03 = 16,129.64/x
  3. Step 3: Cross multiply
    20,920.16x = 28,881.03 × 16,129.64
  4. Step 4: Simplify right side
    20,920.16x = 465,840,616.73
  5. Step 5: Solve for x
    x = 465,840,616.73/20,920.16
  6. Step 6: Final answer
    x = 22,267.55

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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.