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Finding the Fourth Proportional to 874.46, 1,207.03 and 520.65

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Solution

The fourth proportional to 874.46, 1,207.03 and 520.65 is: 718.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.46 : 1,207.03 = 520.65 : x
  2. Step 2: Convert to fraction form
    874.46/1,207.03 = 520.65/x
  3. Step 3: Cross multiply
    874.46x = 1,207.03 × 520.65
  4. Step 4: Simplify right side
    874.46x = 628,434.14
  5. Step 5: Solve for x
    x = 628,434.14/874.46
  6. Step 6: Final answer
    x = 718.65

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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.