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Finding the Fourth Proportional to 20,935, 28,890.12 and 11,374.78

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Solution

The fourth proportional to 20,935, 28,890.12 and 11,374.78 is: 15,697.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,935 : 28,890.12 = 11,374.78 : x
  2. Step 2: Convert to fraction form
    20,935/28,890.12 = 11,374.78/x
  3. Step 3: Cross multiply
    20,935x = 28,890.12 × 11,374.78
  4. Step 4: Simplify right side
    20,935x = 328,618,759.17
  5. Step 5: Solve for x
    x = 328,618,759.17/20,935
  6. Step 6: Final answer
    x = 15,697.10

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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.