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Finding the Fourth Proportional to 715.05, 1,072.78 and 298.78

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Solution

The fourth proportional to 715.05, 1,072.78 and 298.78 is: 448.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.05 : 1,072.78 = 298.78 : x
  2. Step 2: Convert to fraction form
    715.05/1,072.78 = 298.78/x
  3. Step 3: Cross multiply
    715.05x = 1,072.78 × 298.78
  4. Step 4: Simplify right side
    715.05x = 320,519.84
  5. Step 5: Solve for x
    x = 320,519.84/715.05
  6. Step 6: Final answer
    x = 448.25

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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.