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Finding the Fourth Proportional to 20,800.80, 28,705.52 and 11,369.76

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Solution

The fourth proportional to 20,800.80, 28,705.52 and 11,369.76 is: 15,690.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,800.80 : 28,705.52 = 11,369.76 : x
  2. Step 2: Convert to fraction form
    20,800.80/28,705.52 = 11,369.76/x
  3. Step 3: Cross multiply
    20,800.80x = 28,705.52 × 11,369.76
  4. Step 4: Simplify right side
    20,800.80x = 326,374,873.08
  5. Step 5: Solve for x
    x = 326,374,873.08/20,800.80
  6. Step 6: Final answer
    x = 15,690.50

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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.