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Finding the Fourth Proportional to 638,209.80, 957,314.70 and 389,377.80

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Solution

The fourth proportional to 638,209.80, 957,314.70 and 389,377.80 is: 584,066.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,209.80 : 957,314.70 = 389,377.80 : x
  2. Step 2: Convert to fraction form
    638,209.80/957,314.70 = 389,377.80/x
  3. Step 3: Cross multiply
    638,209.80x = 957,314.70 × 389,377.80
  4. Step 4: Simplify right side
    638,209.80x = 372,757,091,793.66
  5. Step 5: Solve for x
    x = 372,757,091,793.66/638,209.80
  6. Step 6: Final answer
    x = 584,066.70

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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.