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Finding the Fourth Proportional to 939.89, 1,297.10 and 520.29

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Solution

The fourth proportional to 939.89, 1,297.10 and 520.29 is: 718.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.89 : 1,297.10 = 520.29 : x
  2. Step 2: Convert to fraction form
    939.89/1,297.10 = 520.29/x
  3. Step 3: Cross multiply
    939.89x = 1,297.10 × 520.29
  4. Step 4: Simplify right side
    939.89x = 674,861.61
  5. Step 5: Solve for x
    x = 674,861.61/939.89
  6. Step 6: Final answer
    x = 718.02

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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.