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Finding the Fourth Proportional to 28,539.30, 42,808.95 and 9,819.79

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Solution

The fourth proportional to 28,539.30, 42,808.95 and 9,819.79 is: 14,729.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,539.30 : 42,808.95 = 9,819.79 : x
  2. Step 2: Convert to fraction form
    28,539.30/42,808.95 = 9,819.79/x
  3. Step 3: Cross multiply
    28,539.30x = 42,808.95 × 9,819.79
  4. Step 4: Simplify right side
    28,539.30x = 420,374,850.02
  5. Step 5: Solve for x
    x = 420,374,850.02/28,539.30
  6. Step 6: Final answer
    x = 14,729.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.