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Finding the Fourth Proportional to 287,405.20, 431,107.80 and 187,872.40

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Solution

The fourth proportional to 287,405.20, 431,107.80 and 187,872.40 is: 281,808.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,405.20 : 431,107.80 = 187,872.40 : x
  2. Step 2: Convert to fraction form
    287,405.20/431,107.80 = 187,872.40/x
  3. Step 3: Cross multiply
    287,405.20x = 431,107.80 × 187,872.40
  4. Step 4: Simplify right side
    287,405.20x = 80,993,257,044.72
  5. Step 5: Solve for x
    x = 80,993,257,044.72/287,405.20
  6. Step 6: Final answer
    x = 281,808.60

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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.