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Finding the Fourth Proportional to 518,627.26, 715,640.43 and 289,128.34

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Solution

The fourth proportional to 518,627.26, 715,640.43 and 289,128.34 is: 398,960.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,627.26 : 715,640.43 = 289,128.34 : x
  2. Step 2: Convert to fraction form
    518,627.26/715,640.43 = 289,128.34/x
  3. Step 3: Cross multiply
    518,627.26x = 715,640.43 × 289,128.34
  4. Step 4: Simplify right side
    518,627.26x = 206,911,929,562.79
  5. Step 5: Solve for x
    x = 206,911,929,562.79/518,627.26
  6. Step 6: Final answer
    x = 398,960.77

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1.5x scale

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.