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Finding the Fourth Proportional to 691.94, 955.04 and 621.87

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Solution

The fourth proportional to 691.94, 955.04 and 621.87 is: 858.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.94 : 955.04 = 621.87 : x
  2. Step 2: Convert to fraction form
    691.94/955.04 = 621.87/x
  3. Step 3: Cross multiply
    691.94x = 955.04 × 621.87
  4. Step 4: Simplify right side
    691.94x = 593,907.62
  5. Step 5: Solve for x
    x = 593,907.62/691.94
  6. Step 6: Final answer
    x = 858.33

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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.