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Finding the Fourth Proportional to 931.93, 1,398.83 and 625.91

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Solution

The fourth proportional to 931.93, 1,398.83 and 625.91 is: 939.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.93 : 1,398.83 = 625.91 : x
  2. Step 2: Convert to fraction form
    931.93/1,398.83 = 625.91/x
  3. Step 3: Cross multiply
    931.93x = 1,398.83 × 625.91
  4. Step 4: Simplify right side
    931.93x = 875,531.56
  5. Step 5: Solve for x
    x = 875,531.56/931.93
  6. Step 6: Final answer
    x = 939.48

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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.