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Finding the Fourth Proportional to 699.71, 966.02 and 621.86

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Solution

The fourth proportional to 699.71, 966.02 and 621.86 is: 858.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.71 : 966.02 = 621.86 : x
  2. Step 2: Convert to fraction form
    699.71/966.02 = 621.86/x
  3. Step 3: Cross multiply
    699.71x = 966.02 × 621.86
  4. Step 4: Simplify right side
    699.71x = 600,731.59
  5. Step 5: Solve for x
    x = 600,731.59/699.71
  6. Step 6: Final answer
    x = 858.54

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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.