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Finding the Fourth Proportional to 686.69, 1,029.93 and 339.93

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Solution

The fourth proportional to 686.69, 1,029.93 and 339.93 is: 509.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.69 : 1,029.93 = 339.93 : x
  2. Step 2: Convert to fraction form
    686.69/1,029.93 = 339.93/x
  3. Step 3: Cross multiply
    686.69x = 1,029.93 × 339.93
  4. Step 4: Simplify right side
    686.69x = 350,104.10
  5. Step 5: Solve for x
    x = 350,104.10/686.69
  6. Step 6: Final answer
    x = 509.84

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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.