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Finding the Fourth Proportional to 688.92, 1,035.22 and 668.88

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Solution

The fourth proportional to 688.92, 1,035.22 and 668.88 is: 1,005.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.92 : 1,035.22 = 668.88 : x
  2. Step 2: Convert to fraction form
    688.92/1,035.22 = 668.88/x
  3. Step 3: Cross multiply
    688.92x = 1,035.22 × 668.88
  4. Step 4: Simplify right side
    688.92x = 692,437.95
  5. Step 5: Solve for x
    x = 692,437.95/688.92
  6. Step 6: Final answer
    x = 1,005.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.