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Finding the Fourth Proportional to 1,216.61, 1,678.53 and 719.42

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Solution

The fourth proportional to 1,216.61, 1,678.53 and 719.42 is: 992.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.61 : 1,678.53 = 719.42 : x
  2. Step 2: Convert to fraction form
    1,216.61/1,678.53 = 719.42/x
  3. Step 3: Cross multiply
    1,216.61x = 1,678.53 × 719.42
  4. Step 4: Simplify right side
    1,216.61x = 1,207,568.05
  5. Step 5: Solve for x
    x = 1,207,568.05/1,216.61
  6. Step 6: Final answer
    x = 992.57

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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.