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Finding the Fourth Proportional to 12,281.60, 18,400.80 and 10,078.40

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Solution

The fourth proportional to 12,281.60, 18,400.80 and 10,078.40 is: 15,099.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,281.60 : 18,400.80 = 10,078.40 : x
  2. Step 2: Convert to fraction form
    12,281.60/18,400.80 = 10,078.40/x
  3. Step 3: Cross multiply
    12,281.60x = 18,400.80 × 10,078.40
  4. Step 4: Simplify right side
    12,281.60x = 185,450,622.72
  5. Step 5: Solve for x
    x = 185,450,622.72/12,281.60
  6. Step 6: Final answer
    x = 15,099.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.