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Finding the Fourth Proportional to 20,585.60, 28,408.16 and 11,154.16

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Solution

The fourth proportional to 20,585.60, 28,408.16 and 11,154.16 is: 15,392.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,585.60 : 28,408.16 = 11,154.16 : x
  2. Step 2: Convert to fraction form
    20,585.60/28,408.16 = 11,154.16/x
  3. Step 3: Cross multiply
    20,585.60x = 28,408.16 × 11,154.16
  4. Step 4: Simplify right side
    20,585.60x = 316,869,161.95
  5. Step 5: Solve for x
    x = 316,869,161.95/20,585.60
  6. Step 6: Final answer
    x = 15,392.76

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.