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Finding the Fourth Proportional to 1,216.70, 1,678.53 and 719.30

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Solution

The fourth proportional to 1,216.70, 1,678.53 and 719.30 is: 992.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.70 : 1,678.53 = 719.30 : x
  2. Step 2: Convert to fraction form
    1,216.70/1,678.53 = 719.30/x
  3. Step 3: Cross multiply
    1,216.70x = 1,678.53 × 719.30
  4. Step 4: Simplify right side
    1,216.70x = 1,207,366.63
  5. Step 5: Solve for x
    x = 1,207,366.63/1,216.70
  6. Step 6: Final answer
    x = 992.33

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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.