Home / 715,905.43-987,968.20-389,240.42

Finding the Fourth Proportional to 715,905.43, 987,968.20 and 389,240.42

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Solution

The fourth proportional to 715,905.43, 987,968.20 and 389,240.42 is: 537,161.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,905.43 : 987,968.20 = 389,240.42 : x
  2. Step 2: Convert to fraction form
    715,905.43/987,968.20 = 389,240.42/x
  3. Step 3: Cross multiply
    715,905.43x = 987,968.20 × 389,240.42
  4. Step 4: Simplify right side
    715,905.43x = 384,557,152,661.35
  5. Step 5: Solve for x
    x = 384,557,152,661.35/715,905.43
  6. Step 6: Final answer
    x = 537,161.95

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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.