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Finding the Fourth Proportional to 699.30, 967.95 and 640.98

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Solution

The fourth proportional to 699.30, 967.95 and 640.98 is: 887.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.30 : 967.95 = 640.98 : x
  2. Step 2: Convert to fraction form
    699.30/967.95 = 640.98/x
  3. Step 3: Cross multiply
    699.30x = 967.95 × 640.98
  4. Step 4: Simplify right side
    699.30x = 620,436.59
  5. Step 5: Solve for x
    x = 620,436.59/699.30
  6. Step 6: Final answer
    x = 887.23

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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.