Home / 645,321.48-890,180.46-387,129.71

Finding the Fourth Proportional to 645,321.48, 890,180.46 and 387,129.71

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Solution

The fourth proportional to 645,321.48, 890,180.46 and 387,129.71 is: 534,021.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,321.48 : 890,180.46 = 387,129.71 : x
  2. Step 2: Convert to fraction form
    645,321.48/890,180.46 = 387,129.71/x
  3. Step 3: Cross multiply
    645,321.48x = 890,180.46 × 387,129.71
  4. Step 4: Simplify right side
    645,321.48x = 344,615,298,876.56
  5. Step 5: Solve for x
    x = 344,615,298,876.56/645,321.48
  6. Step 6: Final answer
    x = 534,021.12

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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.