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Finding the Fourth Proportional to 399,366.90, 551,126.22 and 218,079.60

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Solution

The fourth proportional to 399,366.90, 551,126.22 and 218,079.60 is: 300,949.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,366.90 : 551,126.22 = 218,079.60 : x
  2. Step 2: Convert to fraction form
    399,366.90/551,126.22 = 218,079.60/x
  3. Step 3: Cross multiply
    399,366.90x = 551,126.22 × 218,079.60
  4. Step 4: Simplify right side
    399,366.90x = 120,189,385,607.11
  5. Step 5: Solve for x
    x = 120,189,385,607.11/399,366.90
  6. Step 6: Final answer
    x = 300,949.79

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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.