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Finding the Fourth Proportional to 15,221.60, 20,980.70 and 10,184.02

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Solution

The fourth proportional to 15,221.60, 20,980.70 and 10,184.02 is: 14,037.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,221.60 : 20,980.70 = 10,184.02 : x
  2. Step 2: Convert to fraction form
    15,221.60/20,980.70 = 10,184.02/x
  3. Step 3: Cross multiply
    15,221.60x = 20,980.70 × 10,184.02
  4. Step 4: Simplify right side
    15,221.60x = 213,667,868.41
  5. Step 5: Solve for x
    x = 213,667,868.41/15,221.60
  6. Step 6: Final answer
    x = 14,037.15

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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.