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Finding the Fourth Proportional to 715.68, 1,068.12 and 629.46

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Solution

The fourth proportional to 715.68, 1,068.12 and 629.46 is: 939.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.68 : 1,068.12 = 629.46 : x
  2. Step 2: Convert to fraction form
    715.68/1,068.12 = 629.46/x
  3. Step 3: Cross multiply
    715.68x = 1,068.12 × 629.46
  4. Step 4: Simplify right side
    715.68x = 672,338.82
  5. Step 5: Solve for x
    x = 672,338.82/715.68
  6. Step 6: Final answer
    x = 939.44

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.