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Finding the Fourth Proportional to 8,779.60, 12,117.01 and 5,644.90

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Solution

The fourth proportional to 8,779.60, 12,117.01 and 5,644.90 is: 7,790.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,779.60 : 12,117.01 = 5,644.90 : x
  2. Step 2: Convert to fraction form
    8,779.60/12,117.01 = 5,644.90/x
  3. Step 3: Cross multiply
    8,779.60x = 12,117.01 × 5,644.90
  4. Step 4: Simplify right side
    8,779.60x = 68,399,249.16
  5. Step 5: Solve for x
    x = 68,399,249.16/8,779.60
  6. Step 6: Final answer
    x = 7,790.71

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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.