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Finding the Fourth Proportional to 867.71, 1,299.85 and 558.50

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Solution

The fourth proportional to 867.71, 1,299.85 and 558.50 is: 836.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.71 : 1,299.85 = 558.50 : x
  2. Step 2: Convert to fraction form
    867.71/1,299.85 = 558.50/x
  3. Step 3: Cross multiply
    867.71x = 1,299.85 × 558.50
  4. Step 4: Simplify right side
    867.71x = 725,958.33
  5. Step 5: Solve for x
    x = 725,958.33/867.71
  6. Step 6: Final answer
    x = 836.63

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Double scale
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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.