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Finding the Fourth Proportional to 287,809.70, 431,714.55 and 263,315.30

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Solution

The fourth proportional to 287,809.70, 431,714.55 and 263,315.30 is: 394,972.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,809.70 : 431,714.55 = 263,315.30 : x
  2. Step 2: Convert to fraction form
    287,809.70/431,714.55 = 263,315.30/x
  3. Step 3: Cross multiply
    287,809.70x = 431,714.55 × 263,315.30
  4. Step 4: Simplify right side
    287,809.70x = 113,677,046,247.62
  5. Step 5: Solve for x
    x = 113,677,046,247.62/287,809.70
  6. Step 6: Final answer
    x = 394,972.95

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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.