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Finding the Fourth Proportional to 1,216.74, 1,678.56 and 719.22

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Solution

The fourth proportional to 1,216.74, 1,678.56 and 719.22 is: 992.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.74 : 1,678.56 = 719.22 : x
  2. Step 2: Convert to fraction form
    1,216.74/1,678.56 = 719.22/x
  3. Step 3: Cross multiply
    1,216.74x = 1,678.56 × 719.22
  4. Step 4: Simplify right side
    1,216.74x = 1,207,253.92
  5. Step 5: Solve for x
    x = 1,207,253.92/1,216.74
  6. Step 6: Final answer
    x = 992.20

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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.