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Finding the Fourth Proportional to 709,940.90, 979,714.62 and 387,651.21

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Solution

The fourth proportional to 709,940.90, 979,714.62 and 387,651.21 is: 534,956.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,940.90 : 979,714.62 = 387,651.21 : x
  2. Step 2: Convert to fraction form
    709,940.90/979,714.62 = 387,651.21/x
  3. Step 3: Cross multiply
    709,940.90x = 979,714.62 × 387,651.21
  4. Step 4: Simplify right side
    709,940.90x = 379,787,557,897.69
  5. Step 5: Solve for x
    x = 379,787,557,897.69/709,940.90
  6. Step 6: Final answer
    x = 534,956.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.