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Finding the Fourth Proportional to 720,625.95, 994,446.30 and 398,327.76

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Solution

The fourth proportional to 720,625.95, 994,446.30 and 398,327.76 is: 549,682.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,625.95 : 994,446.30 = 398,327.76 : x
  2. Step 2: Convert to fraction form
    720,625.95/994,446.30 = 398,327.76/x
  3. Step 3: Cross multiply
    720,625.95x = 994,446.30 × 398,327.76
  4. Step 4: Simplify right side
    720,625.95x = 396,115,567,119.29
  5. Step 5: Solve for x
    x = 396,115,567,119.29/720,625.95
  6. Step 6: Final answer
    x = 549,682.63

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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.