Home / 11,990.40-17,865.18-11,319.72

Finding the Fourth Proportional to 11,990.40, 17,865.18 and 11,319.72

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Solution

The fourth proportional to 11,990.40, 17,865.18 and 11,319.72 is: 16,865.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,990.40 : 17,865.18 = 11,319.72 : x
  2. Step 2: Convert to fraction form
    11,990.40/17,865.18 = 11,319.72/x
  3. Step 3: Cross multiply
    11,990.40x = 17,865.18 × 11,319.72
  4. Step 4: Simplify right side
    11,990.40x = 202,228,835.35
  5. Step 5: Solve for x
    x = 202,228,835.35/11,990.40
  6. Step 6: Final answer
    x = 16,865.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.