Home / 399,685.35-551,549.34-218,403.45

Finding the Fourth Proportional to 399,685.35, 551,549.34 and 218,403.45

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Solution

The fourth proportional to 399,685.35, 551,549.34 and 218,403.45 is: 301,387.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,685.35 : 551,549.34 = 218,403.45 : x
  2. Step 2: Convert to fraction form
    399,685.35/551,549.34 = 218,403.45/x
  3. Step 3: Cross multiply
    399,685.35x = 551,549.34 × 218,403.45
  4. Step 4: Simplify right side
    399,685.35x = 120,460,278,701.22
  5. Step 5: Solve for x
    x = 120,460,278,701.22/399,685.35
  6. Step 6: Final answer
    x = 301,387.78

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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.