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Finding the Fourth Proportional to 715.14, 1,072.95 and 440.85

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Solution

The fourth proportional to 715.14, 1,072.95 and 440.85 is: 661.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.14 : 1,072.95 = 440.85 : x
  2. Step 2: Convert to fraction form
    715.14/1,072.95 = 440.85/x
  3. Step 3: Cross multiply
    715.14x = 1,072.95 × 440.85
  4. Step 4: Simplify right side
    715.14x = 473,010.01
  5. Step 5: Solve for x
    x = 473,010.01/715.14
  6. Step 6: Final answer
    x = 661.42

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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.