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Finding the Fourth Proportional to 715.68, 1,072.29 and 390.06

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Solution

The fourth proportional to 715.68, 1,072.29 and 390.06 is: 584.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.68 : 1,072.29 = 390.06 : x
  2. Step 2: Convert to fraction form
    715.68/1,072.29 = 390.06/x
  3. Step 3: Cross multiply
    715.68x = 1,072.29 × 390.06
  4. Step 4: Simplify right side
    715.68x = 418,257.44
  5. Step 5: Solve for x
    x = 418,257.44/715.68
  6. Step 6: Final answer
    x = 584.42

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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.