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Finding the Fourth Proportional to 720,431.61, 994,198.71 and 393,751.20

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Solution

The fourth proportional to 720,431.61, 994,198.71 and 393,751.20 is: 543,378.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,431.61 : 994,198.71 = 393,751.20 : x
  2. Step 2: Convert to fraction form
    720,431.61/994,198.71 = 393,751.20/x
  3. Step 3: Cross multiply
    720,431.61x = 994,198.71 × 393,751.20
  4. Step 4: Simplify right side
    720,431.61x = 391,466,935,100.95
  5. Step 5: Solve for x
    x = 391,466,935,100.95/720,431.61
  6. Step 6: Final answer
    x = 543,378.34

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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.