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Finding the Fourth Proportional to 631,292.80, 946,939.20 and 418,716.40

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Solution

The fourth proportional to 631,292.80, 946,939.20 and 418,716.40 is: 628,074.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,292.80 : 946,939.20 = 418,716.40 : x
  2. Step 2: Convert to fraction form
    631,292.80/946,939.20 = 418,716.40/x
  3. Step 3: Cross multiply
    631,292.80x = 946,939.20 × 418,716.40
  4. Step 4: Simplify right side
    631,292.80x = 396,498,972,842.88
  5. Step 5: Solve for x
    x = 396,498,972,842.88/631,292.80
  6. Step 6: Final answer
    x = 628,074.60

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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.