Home / 20,909.81-28,854.86-11,957.15

Finding the Fourth Proportional to 20,909.81, 28,854.86 and 11,957.15

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Solution

The fourth proportional to 20,909.81, 28,854.86 and 11,957.15 is: 16,500.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,909.81 : 28,854.86 = 11,957.15 : x
  2. Step 2: Convert to fraction form
    20,909.81/28,854.86 = 11,957.15/x
  3. Step 3: Cross multiply
    20,909.81x = 28,854.86 × 11,957.15
  4. Step 4: Simplify right side
    20,909.81x = 345,021,685.19
  5. Step 5: Solve for x
    x = 345,021,685.19/20,909.81
  6. Step 6: Final answer
    x = 16,500.47

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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.