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Finding the Fourth Proportional to 15,057.40, 20,779.92 and 8,684.92

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Solution

The fourth proportional to 15,057.40, 20,779.92 and 8,684.92 is: 11,985.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,057.40 : 20,779.92 = 8,684.92 : x
  2. Step 2: Convert to fraction form
    15,057.40/20,779.92 = 8,684.92/x
  3. Step 3: Cross multiply
    15,057.40x = 20,779.92 × 8,684.92
  4. Step 4: Simplify right side
    15,057.40x = 180,471,942.81
  5. Step 5: Solve for x
    x = 180,471,942.81/15,057.40
  6. Step 6: Final answer
    x = 11,985.60

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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.