Home / 645,121.18-890,286.56-354,717.69

Finding the Fourth Proportional to 645,121.18, 890,286.56 and 354,717.69

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Solution

The fourth proportional to 645,121.18, 890,286.56 and 354,717.69 is: 489,521.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,121.18 : 890,286.56 = 354,717.69 : x
  2. Step 2: Convert to fraction form
    645,121.18/890,286.56 = 354,717.69/x
  3. Step 3: Cross multiply
    645,121.18x = 890,286.56 × 354,717.69
  4. Step 4: Simplify right side
    645,121.18x = 315,800,392,001.25
  5. Step 5: Solve for x
    x = 315,800,392,001.25/645,121.18
  6. Step 6: Final answer
    x = 489,521.04

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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.