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Finding the Fourth Proportional to 720,122, 993,756.60 and 397,845.68

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Solution

The fourth proportional to 720,122, 993,756.60 and 397,845.68 is: 549,020.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,122 : 993,756.60 = 397,845.68 : x
  2. Step 2: Convert to fraction form
    720,122/993,756.60 = 397,845.68/x
  3. Step 3: Cross multiply
    720,122x = 993,756.60 × 397,845.68
  4. Step 4: Simplify right side
    720,122x = 395,361,770,281.49
  5. Step 5: Solve for x
    x = 395,361,770,281.49/720,122
  6. Step 6: Final answer
    x = 549,020.54

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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.