Home / 20,491.39-28,280.24-12,538.90

Finding the Fourth Proportional to 20,491.39, 28,280.24 and 12,538.90

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Solution

The fourth proportional to 20,491.39, 28,280.24 and 12,538.90 is: 17,304.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,491.39 : 28,280.24 = 12,538.90 : x
  2. Step 2: Convert to fraction form
    20,491.39/28,280.24 = 12,538.90/x
  3. Step 3: Cross multiply
    20,491.39x = 28,280.24 × 12,538.90
  4. Step 4: Simplify right side
    20,491.39x = 354,603,101.34
  5. Step 5: Solve for x
    x = 354,603,101.34/20,491.39
  6. Step 6: Final answer
    x = 17,304.98

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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.