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Finding the Fourth Proportional to 287,940.10, 431,906.10 and 130,168.30

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Solution

The fourth proportional to 287,940.10, 431,906.10 and 130,168.30 is: 195,250.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,940.10 : 431,906.10 = 130,168.30 : x
  2. Step 2: Convert to fraction form
    287,940.10/431,906.10 = 130,168.30/x
  3. Step 3: Cross multiply
    287,940.10x = 431,906.10 × 130,168.30
  4. Step 4: Simplify right side
    287,940.10x = 56,220,482,796.63
  5. Step 5: Solve for x
    x = 56,220,482,796.63/287,940.10
  6. Step 6: Final answer
    x = 195,250.62

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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.