Home / 378,109,994.21-521,828,989.55-229,419,445.42

Finding the Fourth Proportional to 378,109,994.21, 521,828,989.55 and 229,419,445.42

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Solution

The fourth proportional to 378,109,994.21, 521,828,989.55 and 229,419,445.42 is: 316,621,404.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,109,994.21 : 521,828,989.55 = 229,419,445.42 : x
  2. Step 2: Convert to fraction form
    378,109,994.21/521,828,989.55 = 229,419,445.42/x
  3. Step 3: Cross multiply
    378,109,994.21x = 521,828,989.55 × 229,419,445.42
  4. Step 4: Simplify right side
    378,109,994.21x = 119,717,717,386,639,968
  5. Step 5: Solve for x
    x = 119,717,717,386,639,968/378,109,994.21
  6. Step 6: Final answer
    x = 316,621,404.41

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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.