Home / 20,808-28,715.56-12,631.70

Finding the Fourth Proportional to 20,808, 28,715.56 and 12,631.70

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Solution

The fourth proportional to 20,808, 28,715.56 and 12,631.70 is: 17,432.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,808 : 28,715.56 = 12,631.70 : x
  2. Step 2: Convert to fraction form
    20,808/28,715.56 = 12,631.70/x
  3. Step 3: Cross multiply
    20,808x = 28,715.56 × 12,631.70
  4. Step 4: Simplify right side
    20,808x = 362,726,339.25
  5. Step 5: Solve for x
    x = 362,726,339.25/20,808
  6. Step 6: Final answer
    x = 17,432.06

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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.