Home / 457,786.20-686,679.30-388,666.20

Finding the Fourth Proportional to 457,786.20, 686,679.30 and 388,666.20

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Solution

The fourth proportional to 457,786.20, 686,679.30 and 388,666.20 is: 582,999.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,786.20 : 686,679.30 = 388,666.20 : x
  2. Step 2: Convert to fraction form
    457,786.20/686,679.30 = 388,666.20/x
  3. Step 3: Cross multiply
    457,786.20x = 686,679.30 × 388,666.20
  4. Step 4: Simplify right side
    457,786.20x = 266,889,034,149.66
  5. Step 5: Solve for x
    x = 266,889,034,149.66/457,786.20
  6. Step 6: Final answer
    x = 582,999.30

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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.