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Finding the Fourth Proportional to 191,431.80, 287,147.70 and 66,772.80

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Solution

The fourth proportional to 191,431.80, 287,147.70 and 66,772.80 is: 100,159.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,431.80 : 287,147.70 = 66,772.80 : x
  2. Step 2: Convert to fraction form
    191,431.80/287,147.70 = 66,772.80/x
  3. Step 3: Cross multiply
    191,431.80x = 287,147.70 × 66,772.80
  4. Step 4: Simplify right side
    191,431.80x = 19,173,655,942.56
  5. Step 5: Solve for x
    x = 19,173,655,942.56/191,431.80
  6. Step 6: Final answer
    x = 100,159.20

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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.