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Finding the Fourth Proportional to 486,245.96, 670,395.66 and 398,708.54

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Solution

The fourth proportional to 486,245.96, 670,395.66 and 398,708.54 is: 549,706.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,245.96 : 670,395.66 = 398,708.54 : x
  2. Step 2: Convert to fraction form
    486,245.96/670,395.66 = 398,708.54/x
  3. Step 3: Cross multiply
    486,245.96x = 670,395.66 × 398,708.54
  4. Step 4: Simplify right side
    486,245.96x = 267,292,474,820.94
  5. Step 5: Solve for x
    x = 267,292,474,820.94/486,245.96
  6. Step 6: Final answer
    x = 549,706.31

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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.