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Finding the Fourth Proportional to 28,779.76, 43,189.20 and 10,311.76

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Solution

The fourth proportional to 28,779.76, 43,189.20 and 10,311.76 is: 15,474.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,779.76 : 43,189.20 = 10,311.76 : x
  2. Step 2: Convert to fraction form
    28,779.76/43,189.20 = 10,311.76/x
  3. Step 3: Cross multiply
    28,779.76x = 43,189.20 × 10,311.76
  4. Step 4: Simplify right side
    28,779.76x = 445,356,664.99
  5. Step 5: Solve for x
    x = 445,356,664.99/28,779.76
  6. Step 6: Final answer
    x = 15,474.65

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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.