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Finding the Fourth Proportional to 931.20, 1,394.06 and 688.82

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Solution

The fourth proportional to 931.20, 1,394.06 and 688.82 is: 1,031.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.20 : 1,394.06 = 688.82 : x
  2. Step 2: Convert to fraction form
    931.20/1,394.06 = 688.82/x
  3. Step 3: Cross multiply
    931.20x = 1,394.06 × 688.82
  4. Step 4: Simplify right side
    931.20x = 960,245.99
  5. Step 5: Solve for x
    x = 960,245.99/931.20
  6. Step 6: Final answer
    x = 1,031.19

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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.