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Finding the Fourth Proportional to 939.89, 1,297.47 and 625.71

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Solution

The fourth proportional to 939.89, 1,297.47 and 625.71 is: 863.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.89 : 1,297.47 = 625.71 : x
  2. Step 2: Convert to fraction form
    939.89/1,297.47 = 625.71/x
  3. Step 3: Cross multiply
    939.89x = 1,297.47 × 625.71
  4. Step 4: Simplify right side
    939.89x = 811,839.95
  5. Step 5: Solve for x
    x = 811,839.95/939.89
  6. Step 6: Final answer
    x = 863.77

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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.