Home / 20,491.69-28,279.88-15,447.01

Finding the Fourth Proportional to 20,491.69, 28,279.88 and 15,447.01

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Solution

The fourth proportional to 20,491.69, 28,279.88 and 15,447.01 is: 21,317.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,491.69 : 28,279.88 = 15,447.01 : x
  2. Step 2: Convert to fraction form
    20,491.69/28,279.88 = 15,447.01/x
  3. Step 3: Cross multiply
    20,491.69x = 28,279.88 × 15,447.01
  4. Step 4: Simplify right side
    20,491.69x = 436,839,511.92
  5. Step 5: Solve for x
    x = 436,839,511.92/20,491.69
  6. Step 6: Final answer
    x = 21,317.89

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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.