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Finding the Fourth Proportional to 686.22, 1,027.23 and 442.23

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Solution

The fourth proportional to 686.22, 1,027.23 and 442.23 is: 661.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.22 : 1,027.23 = 442.23 : x
  2. Step 2: Convert to fraction form
    686.22/1,027.23 = 442.23/x
  3. Step 3: Cross multiply
    686.22x = 1,027.23 × 442.23
  4. Step 4: Simplify right side
    686.22x = 454,271.92
  5. Step 5: Solve for x
    x = 454,271.92/686.22
  6. Step 6: Final answer
    x = 661.99

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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.