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Finding the Fourth Proportional to 399,378.84, 551,138.49 and 218,090.22

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Solution

The fourth proportional to 399,378.84, 551,138.49 and 218,090.22 is: 300,962.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,378.84 : 551,138.49 = 218,090.22 : x
  2. Step 2: Convert to fraction form
    399,378.84/551,138.49 = 218,090.22/x
  3. Step 3: Cross multiply
    399,378.84x = 551,138.49 × 218,090.22
  4. Step 4: Simplify right side
    399,378.84x = 120,197,914,534.57
  5. Step 5: Solve for x
    x = 120,197,914,534.57/399,378.84
  6. Step 6: Final answer
    x = 300,962.15

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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.