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Finding the Fourth Proportional to 699.59, 1,042.20 and 668.00

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Solution

The fourth proportional to 699.59, 1,042.20 and 668.00 is: 995.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.59 : 1,042.20 = 668.00 : x
  2. Step 2: Convert to fraction form
    699.59/1,042.20 = 668.00/x
  3. Step 3: Cross multiply
    699.59x = 1,042.20 × 668.00
  4. Step 4: Simplify right side
    699.59x = 696,184.39
  5. Step 5: Solve for x
    x = 696,184.39/699.59
  6. Step 6: Final answer
    x = 995.14

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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.