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Finding the Fourth Proportional to 15,057.79, 20,779.19 and 8,684.65

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Solution

The fourth proportional to 15,057.79, 20,779.19 and 8,684.65 is: 11,984.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,057.79 : 20,779.19 = 8,684.65 : x
  2. Step 2: Convert to fraction form
    15,057.79/20,779.19 = 8,684.65/x
  3. Step 3: Cross multiply
    15,057.79x = 20,779.19 × 8,684.65
  4. Step 4: Simplify right side
    15,057.79x = 180,460,007.55
  5. Step 5: Solve for x
    x = 180,460,007.55/15,057.79
  6. Step 6: Final answer
    x = 11,984.50

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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.