Home / 720,200,385.78-993,877,540.88-390,175,524.78

Finding the Fourth Proportional to 720,200,385.78, 993,877,540.88 and 390,175,524.78

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Solution

The fourth proportional to 720,200,385.78, 993,877,540.88 and 390,175,524.78 is: 538,442,770.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,200,385.78 : 993,877,540.88 = 390,175,524.78 : x
  2. Step 2: Convert to fraction form
    720,200,385.78/993,877,540.88 = 390,175,524.78/x
  3. Step 3: Cross multiply
    720,200,385.78x = 993,877,540.88 × 390,175,524.78
  4. Step 4: Simplify right side
    720,200,385.78x = 387,786,691,077,958,976
  5. Step 5: Solve for x
    x = 387,786,691,077,958,976/720,200,385.78
  6. Step 6: Final answer
    x = 538,442,770.56

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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.