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Finding the Fourth Proportional to 398,515.80, 598,464.90 and 281,011.80

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Solution

The fourth proportional to 398,515.80, 598,464.90 and 281,011.80 is: 422,005.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,515.80 : 598,464.90 = 281,011.80 : x
  2. Step 2: Convert to fraction form
    398,515.80/598,464.90 = 281,011.80/x
  3. Step 3: Cross multiply
    398,515.80x = 598,464.90 × 281,011.80
  4. Step 4: Simplify right side
    398,515.80x = 168,175,698,785.82
  5. Step 5: Solve for x
    x = 168,175,698,785.82/398,515.80
  6. Step 6: Final answer
    x = 422,005.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.