Home / 20,780.50-28,677.25-11,349.07

Finding the Fourth Proportional to 20,780.50, 28,677.25 and 11,349.07

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Solution

The fourth proportional to 20,780.50, 28,677.25 and 11,349.07 is: 15,661.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.50 : 28,677.25 = 11,349.07 : x
  2. Step 2: Convert to fraction form
    20,780.50/28,677.25 = 11,349.07/x
  3. Step 3: Cross multiply
    20,780.50x = 28,677.25 × 11,349.07
  4. Step 4: Simplify right side
    20,780.50x = 325,459,974.27
  5. Step 5: Solve for x
    x = 325,459,974.27/20,780.50
  6. Step 6: Final answer
    x = 15,661.80

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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.