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Finding the Fourth Proportional to 191,812.80, 287,719.20 and 67,166.40

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Solution

The fourth proportional to 191,812.80, 287,719.20 and 67,166.40 is: 100,749.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,812.80 : 287,719.20 = 67,166.40 : x
  2. Step 2: Convert to fraction form
    191,812.80/287,719.20 = 67,166.40/x
  3. Step 3: Cross multiply
    191,812.80x = 287,719.20 × 67,166.40
  4. Step 4: Simplify right side
    191,812.80x = 19,325,062,874.88
  5. Step 5: Solve for x
    x = 19,325,062,874.88/191,812.80
  6. Step 6: Final answer
    x = 100,749.60

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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.