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Finding the Fourth Proportional to 715.92, 1,072.88 and 390.56

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Solution

The fourth proportional to 715.92, 1,072.88 and 390.56 is: 585.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.92 : 1,072.88 = 390.56 : x
  2. Step 2: Convert to fraction form
    715.92/1,072.88 = 390.56/x
  3. Step 3: Cross multiply
    715.92x = 1,072.88 × 390.56
  4. Step 4: Simplify right side
    715.92x = 419,024.01
  5. Step 5: Solve for x
    x = 419,024.01/715.92
  6. Step 6: Final answer
    x = 585.29

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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.