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Finding the Fourth Proportional to 28,499.87, 42,750.68 and 9,779.65

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Solution

The fourth proportional to 28,499.87, 42,750.68 and 9,779.65 is: 14,669.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,499.87 : 42,750.68 = 9,779.65 : x
  2. Step 2: Convert to fraction form
    28,499.87/42,750.68 = 9,779.65/x
  3. Step 3: Cross multiply
    28,499.87x = 42,750.68 × 9,779.65
  4. Step 4: Simplify right side
    28,499.87x = 418,086,687.66
  5. Step 5: Solve for x
    x = 418,086,687.66/28,499.87
  6. Step 6: Final answer
    x = 14,669.78

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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.