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Finding the Fourth Proportional to 686.00, 1,022.48 and 663.50

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Solution

The fourth proportional to 686.00, 1,022.48 and 663.50 is: 988.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.00 : 1,022.48 = 663.50 : x
  2. Step 2: Convert to fraction form
    686.00/1,022.48 = 663.50/x
  3. Step 3: Cross multiply
    686.00x = 1,022.48 × 663.50
  4. Step 4: Simplify right side
    686.00x = 678,407.05
  5. Step 5: Solve for x
    x = 678,407.05/686.00
  6. Step 6: Final answer
    x = 988.94

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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.