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Finding the Fourth Proportional to 664,360.80, 996,638.40 and 215,005.20

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Solution

The fourth proportional to 664,360.80, 996,638.40 and 215,005.20 is: 322,539.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,360.80 : 996,638.40 = 215,005.20 : x
  2. Step 2: Convert to fraction form
    664,360.80/996,638.40 = 215,005.20/x
  3. Step 3: Cross multiply
    664,360.80x = 996,638.40 × 215,005.20
  4. Step 4: Simplify right side
    664,360.80x = 214,282,438,519.68
  5. Step 5: Solve for x
    x = 214,282,438,519.68/664,360.80
  6. Step 6: Final answer
    x = 322,539.26

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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.