Home / 20,909.80-31,369.20-6,117.58

Finding the Fourth Proportional to 20,909.80, 31,369.20 and 6,117.58

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Solution

The fourth proportional to 20,909.80, 31,369.20 and 6,117.58 is: 9,177.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,909.80 : 31,369.20 = 6,117.58 : x
  2. Step 2: Convert to fraction form
    20,909.80/31,369.20 = 6,117.58/x
  3. Step 3: Cross multiply
    20,909.80x = 31,369.20 × 6,117.58
  4. Step 4: Simplify right side
    20,909.80x = 191,903,590.54
  5. Step 5: Solve for x
    x = 191,903,590.54/20,909.80
  6. Step 6: Final answer
    x = 9,177.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.