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Finding the Fourth Proportional to 911.74, 1,258.40 and 580.10

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Solution

The fourth proportional to 911.74, 1,258.40 and 580.10 is: 800.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.74 : 1,258.40 = 580.10 : x
  2. Step 2: Convert to fraction form
    911.74/1,258.40 = 580.10/x
  3. Step 3: Cross multiply
    911.74x = 1,258.40 × 580.10
  4. Step 4: Simplify right side
    911.74x = 729,997.84
  5. Step 5: Solve for x
    x = 729,997.84/911.74
  6. Step 6: Final answer
    x = 800.66

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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.