Home / 645,375.12-890,437.62-387,090.42

Finding the Fourth Proportional to 645,375.12, 890,437.62 and 387,090.42

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Solution

The fourth proportional to 645,375.12, 890,437.62 and 387,090.42 is: 534,076.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,375.12 : 890,437.62 = 387,090.42 : x
  2. Step 2: Convert to fraction form
    645,375.12/890,437.62 = 387,090.42/x
  3. Step 3: Cross multiply
    645,375.12x = 890,437.62 × 387,090.42
  4. Step 4: Simplify right side
    645,375.12x = 344,679,872,309.60
  5. Step 5: Solve for x
    x = 344,679,872,309.60/645,375.12
  6. Step 6: Final answer
    x = 534,076.79

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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.