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Finding the Fourth Proportional to 287,701.80, 431,682.30 and 137,884.20

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Solution

The fourth proportional to 287,701.80, 431,682.30 and 137,884.20 is: 206,888.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,701.80 : 431,682.30 = 137,884.20 : x
  2. Step 2: Convert to fraction form
    287,701.80/431,682.30 = 137,884.20/x
  3. Step 3: Cross multiply
    287,701.80x = 431,682.30 × 137,884.20
  4. Step 4: Simplify right side
    287,701.80x = 59,522,168,589.66
  5. Step 5: Solve for x
    x = 59,522,168,589.66/287,701.80
  6. Step 6: Final answer
    x = 206,888.41

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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.