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Finding the Fourth Proportional to 720,382.86, 994,131.42 and 393,702.54

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Solution

The fourth proportional to 720,382.86, 994,131.42 and 393,702.54 is: 543,311.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,382.86 : 994,131.42 = 393,702.54 : x
  2. Step 2: Convert to fraction form
    720,382.86/994,131.42 = 393,702.54/x
  3. Step 3: Cross multiply
    720,382.86x = 994,131.42 × 393,702.54
  4. Step 4: Simplify right side
    720,382.86x = 391,392,065,147.81
  5. Step 5: Solve for x
    x = 391,392,065,147.81/720,382.86
  6. Step 6: Final answer
    x = 543,311.18

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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.