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Finding the Fourth Proportional to 1,216.86, 1,678.88 and 719.67

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Solution

The fourth proportional to 1,216.86, 1,678.88 and 719.67 is: 992.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.86 : 1,678.88 = 719.67 : x
  2. Step 2: Convert to fraction form
    1,216.86/1,678.88 = 719.67/x
  3. Step 3: Cross multiply
    1,216.86x = 1,678.88 × 719.67
  4. Step 4: Simplify right side
    1,216.86x = 1,208,239.57
  5. Step 5: Solve for x
    x = 1,208,239.57/1,216.86
  6. Step 6: Final answer
    x = 992.92

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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.