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Finding the Fourth Proportional to 715.70, 1,072.20 and 667.10

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Solution

The fourth proportional to 715.70, 1,072.20 and 667.10 is: 999.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.70 : 1,072.20 = 667.10 : x
  2. Step 2: Convert to fraction form
    715.70/1,072.20 = 667.10/x
  3. Step 3: Cross multiply
    715.70x = 1,072.20 × 667.10
  4. Step 4: Simplify right side
    715.70x = 715,264.62
  5. Step 5: Solve for x
    x = 715,264.62/715.70
  6. Step 6: Final answer
    x = 999.39

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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.