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Finding the Fourth Proportional to 518,440.50, 715,447.90 and 279,976.50

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Solution

The fourth proportional to 518,440.50, 715,447.90 and 279,976.50 is: 386,367.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,440.50 : 715,447.90 = 279,976.50 : x
  2. Step 2: Convert to fraction form
    518,440.50/715,447.90 = 279,976.50/x
  3. Step 3: Cross multiply
    518,440.50x = 715,447.90 × 279,976.50
  4. Step 4: Simplify right side
    518,440.50x = 200,308,598,974.35
  5. Step 5: Solve for x
    x = 200,308,598,974.35/518,440.50
  6. Step 6: Final answer
    x = 386,367.58

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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.