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Finding the Fourth Proportional to 661,998.80, 992,998.20 and 218,766.80

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Solution

The fourth proportional to 661,998.80, 992,998.20 and 218,766.80 is: 328,150.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,998.80 : 992,998.20 = 218,766.80 : x
  2. Step 2: Convert to fraction form
    661,998.80/992,998.20 = 218,766.80/x
  3. Step 3: Cross multiply
    661,998.80x = 992,998.20 × 218,766.80
  4. Step 4: Simplify right side
    661,998.80x = 217,235,038,619.76
  5. Step 5: Solve for x
    x = 217,235,038,619.76/661,998.80
  6. Step 6: Final answer
    x = 328,150.20

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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.