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Finding the Fourth Proportional to 664,897.80, 997,321.10 and 221,665.80

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Solution

The fourth proportional to 664,897.80, 997,321.10 and 221,665.80 is: 332,490.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,897.80 : 997,321.10 = 221,665.80 : x
  2. Step 2: Convert to fraction form
    664,897.80/997,321.10 = 221,665.80/x
  3. Step 3: Cross multiply
    664,897.80x = 997,321.10 × 221,665.80
  4. Step 4: Simplify right side
    664,897.80x = 221,071,979,488.38
  5. Step 5: Solve for x
    x = 221,071,979,488.38/664,897.80
  6. Step 6: Final answer
    x = 332,490.17

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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.