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Finding the Fourth Proportional to 442,878.20, 664,317.30 and 218,281.40

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Solution

The fourth proportional to 442,878.20, 664,317.30 and 218,281.40 is: 327,422.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    442,878.20 : 664,317.30 = 218,281.40 : x
  2. Step 2: Convert to fraction form
    442,878.20/664,317.30 = 218,281.40/x
  3. Step 3: Cross multiply
    442,878.20x = 664,317.30 × 218,281.40
  4. Step 4: Simplify right side
    442,878.20x = 145,008,110,288.22
  5. Step 5: Solve for x
    x = 145,008,110,288.22/442,878.20
  6. Step 6: Final answer
    x = 327,422.10

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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.