Home / 820,330.80-1,230,496.20-287,905.65

Finding the Fourth Proportional to 820,330.80, 1,230,496.20 and 287,905.65

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Solution

The fourth proportional to 820,330.80, 1,230,496.20 and 287,905.65 is: 431,858.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,330.80 : 1,230,496.20 = 287,905.65 : x
  2. Step 2: Convert to fraction form
    820,330.80/1,230,496.20 = 287,905.65/x
  3. Step 3: Cross multiply
    820,330.80x = 1,230,496.20 × 287,905.65
  4. Step 4: Simplify right side
    820,330.80x = 354,266,808,283.53
  5. Step 5: Solve for x
    x = 354,266,808,283.53/820,330.80
  6. Step 6: Final answer
    x = 431,858.48

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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.