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Finding the Fourth Proportional to 1,219.76, 1,682.73 and 715.67

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Solution

The fourth proportional to 1,219.76, 1,682.73 and 715.67 is: 987.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.76 : 1,682.73 = 715.67 : x
  2. Step 2: Convert to fraction form
    1,219.76/1,682.73 = 715.67/x
  3. Step 3: Cross multiply
    1,219.76x = 1,682.73 × 715.67
  4. Step 4: Simplify right side
    1,219.76x = 1,204,270.97
  5. Step 5: Solve for x
    x = 1,204,270.97/1,219.76
  6. Step 6: Final answer
    x = 987.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.