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Finding the Fourth Proportional to 720,108.64, 993,745.20 and 397,839.52

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Solution

The fourth proportional to 720,108.64, 993,745.20 and 397,839.52 is: 549,015.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,108.64 : 993,745.20 = 397,839.52 : x
  2. Step 2: Convert to fraction form
    720,108.64/993,745.20 = 397,839.52/x
  3. Step 3: Cross multiply
    720,108.64x = 993,745.20 × 397,839.52
  4. Step 4: Simplify right side
    720,108.64x = 395,351,113,370.30
  5. Step 5: Solve for x
    x = 395,351,113,370.30/720,108.64
  6. Step 6: Final answer
    x = 549,015.93

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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.