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Finding the Fourth Proportional to 686.06, 1,029.21 and 357.15

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Solution

The fourth proportional to 686.06, 1,029.21 and 357.15 is: 535.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.06 : 1,029.21 = 357.15 : x
  2. Step 2: Convert to fraction form
    686.06/1,029.21 = 357.15/x
  3. Step 3: Cross multiply
    686.06x = 1,029.21 × 357.15
  4. Step 4: Simplify right side
    686.06x = 367,582.35
  5. Step 5: Solve for x
    x = 367,582.35/686.06
  6. Step 6: Final answer
    x = 535.79

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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.