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Finding the Fourth Proportional to 699.84, 1,043.23 and 668.40

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Solution

The fourth proportional to 699.84, 1,043.23 and 668.40 is: 996.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.84 : 1,043.23 = 668.40 : x
  2. Step 2: Convert to fraction form
    699.84/1,043.23 = 668.40/x
  3. Step 3: Cross multiply
    699.84x = 1,043.23 × 668.40
  4. Step 4: Simplify right side
    699.84x = 697,294.93
  5. Step 5: Solve for x
    x = 697,294.93/699.84
  6. Step 6: Final answer
    x = 996.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.