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Finding the Fourth Proportional to 479,568.60, 661,820.70 and 261,790.20

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Solution

The fourth proportional to 479,568.60, 661,820.70 and 261,790.20 is: 361,279.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,568.60 : 661,820.70 = 261,790.20 : x
  2. Step 2: Convert to fraction form
    479,568.60/661,820.70 = 261,790.20/x
  3. Step 3: Cross multiply
    479,568.60x = 661,820.70 × 261,790.20
  4. Step 4: Simplify right side
    479,568.60x = 173,258,173,417.14
  5. Step 5: Solve for x
    x = 173,258,173,417.14/479,568.60
  6. Step 6: Final answer
    x = 361,279.23

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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.