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Finding the Fourth Proportional to 686.00, 1,029.15 and 253.19

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Solution

The fourth proportional to 686.00, 1,029.15 and 253.19 is: 379.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.00 : 1,029.15 = 253.19 : x
  2. Step 2: Convert to fraction form
    686.00/1,029.15 = 253.19/x
  3. Step 3: Cross multiply
    686.00x = 1,029.15 × 253.19
  4. Step 4: Simplify right side
    686.00x = 260,573.06
  5. Step 5: Solve for x
    x = 260,573.06/686.00
  6. Step 6: Final answer
    x = 379.84

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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.