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Finding the Fourth Proportional to 720,784.95, 994,704 and 398,515.86

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Solution

The fourth proportional to 720,784.95, 994,704 and 398,515.86 is: 549,963.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,784.95 : 994,704 = 398,515.86 : x
  2. Step 2: Convert to fraction form
    720,784.95/994,704 = 398,515.86/x
  3. Step 3: Cross multiply
    720,784.95x = 994,704 × 398,515.86
  4. Step 4: Simplify right side
    720,784.95x = 396,405,320,005.44
  5. Step 5: Solve for x
    x = 396,405,320,005.44/720,784.95
  6. Step 6: Final answer
    x = 549,963.37

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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.