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Finding the Fourth Proportional to 626.11, 939.40 and 260.87

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Solution

The fourth proportional to 626.11, 939.40 and 260.87 is: 391.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.11 : 939.40 = 260.87 : x
  2. Step 2: Convert to fraction form
    626.11/939.40 = 260.87/x
  3. Step 3: Cross multiply
    626.11x = 939.40 × 260.87
  4. Step 4: Simplify right side
    626.11x = 245,055.93
  5. Step 5: Solve for x
    x = 245,055.93/626.11
  6. Step 6: Final answer
    x = 391.40

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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.