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Finding the Fourth Proportional to 720,394.67, 994,059.95 and 398,085.54

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Solution

The fourth proportional to 720,394.67, 994,059.95 and 398,085.54 is: 549,311.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,394.67 : 994,059.95 = 398,085.54 : x
  2. Step 2: Convert to fraction form
    720,394.67/994,059.95 = 398,085.54/x
  3. Step 3: Cross multiply
    720,394.67x = 994,059.95 × 398,085.54
  4. Step 4: Simplify right side
    720,394.67x = 395,720,889,997.70
  5. Step 5: Solve for x
    x = 395,720,889,997.70/720,394.67
  6. Step 6: Final answer
    x = 549,311.24

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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.