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Finding the Fourth Proportional to 874.51, 1,311.71 and 484.70

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Solution

The fourth proportional to 874.51, 1,311.71 and 484.70 is: 727.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.51 : 1,311.71 = 484.70 : x
  2. Step 2: Convert to fraction form
    874.51/1,311.71 = 484.70/x
  3. Step 3: Cross multiply
    874.51x = 1,311.71 × 484.70
  4. Step 4: Simplify right side
    874.51x = 635,776.85
  5. Step 5: Solve for x
    x = 635,776.85/874.51
  6. Step 6: Final answer
    x = 727.01

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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.