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Finding the Fourth Proportional to 19,167.20, 28,750.80 and 8,086.40

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Solution

The fourth proportional to 19,167.20, 28,750.80 and 8,086.40 is: 12,129.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,167.20 : 28,750.80 = 8,086.40 : x
  2. Step 2: Convert to fraction form
    19,167.20/28,750.80 = 8,086.40/x
  3. Step 3: Cross multiply
    19,167.20x = 28,750.80 × 8,086.40
  4. Step 4: Simplify right side
    19,167.20x = 232,490,469.12
  5. Step 5: Solve for x
    x = 232,490,469.12/19,167.20
  6. Step 6: Final answer
    x = 12,129.60

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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.