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Finding the Fourth Proportional to 20,378.30, 28,099.30 and 12,815.40

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Solution

The fourth proportional to 20,378.30, 28,099.30 and 12,815.40 is: 17,670.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.30 : 28,099.30 = 12,815.40 : x
  2. Step 2: Convert to fraction form
    20,378.30/28,099.30 = 12,815.40/x
  3. Step 3: Cross multiply
    20,378.30x = 28,099.30 × 12,815.40
  4. Step 4: Simplify right side
    20,378.30x = 360,103,769.22
  5. Step 5: Solve for x
    x = 360,103,769.22/20,378.30
  6. Step 6: Final answer
    x = 17,670.94

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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.