Home / 640,976.68-884,820.19-399,378.62

Finding the Fourth Proportional to 640,976.68, 884,820.19 and 399,378.62

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Solution

The fourth proportional to 640,976.68, 884,820.19 and 399,378.62 is: 551,312.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,976.68 : 884,820.19 = 399,378.62 : x
  2. Step 2: Convert to fraction form
    640,976.68/884,820.19 = 399,378.62/x
  3. Step 3: Cross multiply
    640,976.68x = 884,820.19 × 399,378.62
  4. Step 4: Simplify right side
    640,976.68x = 353,378,264,433.45
  5. Step 5: Solve for x
    x = 353,378,264,433.45/640,976.68
  6. Step 6: Final answer
    x = 551,312.20

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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.