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Finding the Fourth Proportional to 18,775.70, 28,166.66 and 8,909.60

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Solution

The fourth proportional to 18,775.70, 28,166.66 and 8,909.60 is: 13,365.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,775.70 : 28,166.66 = 8,909.60 : x
  2. Step 2: Convert to fraction form
    18,775.70/28,166.66 = 8,909.60/x
  3. Step 3: Cross multiply
    18,775.70x = 28,166.66 × 8,909.60
  4. Step 4: Simplify right side
    18,775.70x = 250,953,488.55
  5. Step 5: Solve for x
    x = 250,953,488.55/18,775.70
  6. Step 6: Final answer
    x = 13,365.87

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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.