Home / 9,989.20-13,779.91-8,102.92

Finding the Fourth Proportional to 9,989.20, 13,779.91 and 8,102.92

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Solution

The fourth proportional to 9,989.20, 13,779.91 and 8,102.92 is: 11,177.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,989.20 : 13,779.91 = 8,102.92 : x
  2. Step 2: Convert to fraction form
    9,989.20/13,779.91 = 8,102.92/x
  3. Step 3: Cross multiply
    9,989.20x = 13,779.91 × 8,102.92
  4. Step 4: Simplify right side
    9,989.20x = 111,657,508.34
  5. Step 5: Solve for x
    x = 111,657,508.34/9,989.20
  6. Step 6: Final answer
    x = 11,177.82

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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.