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Finding the Fourth Proportional to 491,515, 678,174.06 and 276,612.28

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Solution

The fourth proportional to 491,515, 678,174.06 and 276,612.28 is: 381,659.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,515 : 678,174.06 = 276,612.28 : x
  2. Step 2: Convert to fraction form
    491,515/678,174.06 = 276,612.28/x
  3. Step 3: Cross multiply
    491,515x = 678,174.06 × 276,612.28
  4. Step 4: Simplify right side
    491,515x = 187,591,272,973.46
  5. Step 5: Solve for x
    x = 187,591,272,973.46/491,515
  6. Step 6: Final answer
    x = 381,659.30

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.