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Finding the Fourth Proportional to 664,653.90, 996,980.85 and 221,421.90

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Solution

The fourth proportional to 664,653.90, 996,980.85 and 221,421.90 is: 332,132.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,653.90 : 996,980.85 = 221,421.90 : x
  2. Step 2: Convert to fraction form
    664,653.90/996,980.85 = 221,421.90/x
  3. Step 3: Cross multiply
    664,653.90x = 996,980.85 × 221,421.90
  4. Step 4: Simplify right side
    664,653.90x = 220,753,394,070.62
  5. Step 5: Solve for x
    x = 220,753,394,070.62/664,653.90
  6. Step 6: Final answer
    x = 332,132.85

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Double scale
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Similar ratio
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1.5x scale

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.