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Finding the Fourth Proportional to 1,115.46, 1,670.10 and 840.73

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Solution

The fourth proportional to 1,115.46, 1,670.10 and 840.73 is: 1,258.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.46 : 1,670.10 = 840.73 : x
  2. Step 2: Convert to fraction form
    1,115.46/1,670.10 = 840.73/x
  3. Step 3: Cross multiply
    1,115.46x = 1,670.10 × 840.73
  4. Step 4: Simplify right side
    1,115.46x = 1,404,098.97
  5. Step 5: Solve for x
    x = 1,404,098.97/1,115.46
  6. Step 6: Final answer
    x = 1,258.76

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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.