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Finding the Fourth Proportional to 287,599.40, 431,361.30 and 87,939.80

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Solution

The fourth proportional to 287,599.40, 431,361.30 and 87,939.80 is: 131,898.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,599.40 : 431,361.30 = 87,939.80 : x
  2. Step 2: Convert to fraction form
    287,599.40/431,361.30 = 87,939.80/x
  3. Step 3: Cross multiply
    287,599.40x = 431,361.30 × 87,939.80
  4. Step 4: Simplify right side
    287,599.40x = 37,933,826,449.74
  5. Step 5: Solve for x
    x = 37,933,826,449.74/287,599.40
  6. Step 6: Final answer
    x = 131,898.14

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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.