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Finding the Fourth Proportional to 1,216.48, 1,678.80 and 774.46

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Solution

The fourth proportional to 1,216.48, 1,678.80 and 774.46 is: 1,068.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.48 : 1,678.80 = 774.46 : x
  2. Step 2: Convert to fraction form
    1,216.48/1,678.80 = 774.46/x
  3. Step 3: Cross multiply
    1,216.48x = 1,678.80 × 774.46
  4. Step 4: Simplify right side
    1,216.48x = 1,300,163.45
  5. Step 5: Solve for x
    x = 1,300,163.45/1,216.48
  6. Step 6: Final answer
    x = 1,068.79

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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.