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Finding the Fourth Proportional to 720,190.72, 993,778.56 and 397,881.60

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Solution

The fourth proportional to 720,190.72, 993,778.56 and 397,881.60 is: 549,029.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,190.72 : 993,778.56 = 397,881.60 : x
  2. Step 2: Convert to fraction form
    720,190.72/993,778.56 = 397,881.60/x
  3. Step 3: Cross multiply
    720,190.72x = 993,778.56 × 397,881.60
  4. Step 4: Simplify right side
    720,190.72x = 395,406,203,498.50
  5. Step 5: Solve for x
    x = 395,406,203,498.50/720,190.72
  6. Step 6: Final answer
    x = 549,029.85

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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.