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Finding the Fourth Proportional to 686.99, 1,030.44 and 193.39

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Solution

The fourth proportional to 686.99, 1,030.44 and 193.39 is: 290.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.99 : 1,030.44 = 193.39 : x
  2. Step 2: Convert to fraction form
    686.99/1,030.44 = 193.39/x
  3. Step 3: Cross multiply
    686.99x = 1,030.44 × 193.39
  4. Step 4: Simplify right side
    686.99x = 199,276.79
  5. Step 5: Solve for x
    x = 199,276.79/686.99
  6. Step 6: Final answer
    x = 290.07

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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.