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Finding the Fourth Proportional to 749.99, 1,029.39 and 687.68

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Solution

The fourth proportional to 749.99, 1,029.39 and 687.68 is: 943.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.99 : 1,029.39 = 687.68 : x
  2. Step 2: Convert to fraction form
    749.99/1,029.39 = 687.68/x
  3. Step 3: Cross multiply
    749.99x = 1,029.39 × 687.68
  4. Step 4: Simplify right side
    749.99x = 707,885.77
  5. Step 5: Solve for x
    x = 707,885.77/749.99
  6. Step 6: Final answer
    x = 943.87

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.