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Finding the Fourth Proportional to 720,789.94, 994,710.90 and 398,520.86

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Solution

The fourth proportional to 720,789.94, 994,710.90 and 398,520.86 is: 549,970.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,789.94 : 994,710.90 = 398,520.86 : x
  2. Step 2: Convert to fraction form
    720,789.94/994,710.90 = 398,520.86/x
  3. Step 3: Cross multiply
    720,789.94x = 994,710.90 × 398,520.86
  4. Step 4: Simplify right side
    720,789.94x = 396,413,043,319.37
  5. Step 5: Solve for x
    x = 396,413,043,319.37/720,789.94
  6. Step 6: Final answer
    x = 549,970.28

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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.