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Finding the Fourth Proportional to 720,294.15, 993,979.21 and 397,997.58

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Solution

The fourth proportional to 720,294.15, 993,979.21 and 397,997.58 is: 549,221.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,294.15 : 993,979.21 = 397,997.58 : x
  2. Step 2: Convert to fraction form
    720,294.15/993,979.21 = 397,997.58/x
  3. Step 3: Cross multiply
    720,294.15x = 993,979.21 × 397,997.58
  4. Step 4: Simplify right side
    720,294.15x = 395,601,320,150.31
  5. Step 5: Solve for x
    x = 395,601,320,150.31/720,294.15
  6. Step 6: Final answer
    x = 549,221.90

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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.