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Finding the Fourth Proportional to 874.64, 1,206.99 and 481.69

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Solution

The fourth proportional to 874.64, 1,206.99 and 481.69 is: 664.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.64 : 1,206.99 = 481.69 : x
  2. Step 2: Convert to fraction form
    874.64/1,206.99 = 481.69/x
  3. Step 3: Cross multiply
    874.64x = 1,206.99 × 481.69
  4. Step 4: Simplify right side
    874.64x = 581,392.00
  5. Step 5: Solve for x
    x = 581,392.00/874.64
  6. Step 6: Final answer
    x = 664.72

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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.