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Finding the Fourth Proportional to 779.18, 1,074.36 and 668.72

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Solution

The fourth proportional to 779.18, 1,074.36 and 668.72 is: 922.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.18 : 1,074.36 = 668.72 : x
  2. Step 2: Convert to fraction form
    779.18/1,074.36 = 668.72/x
  3. Step 3: Cross multiply
    779.18x = 1,074.36 × 668.72
  4. Step 4: Simplify right side
    779.18x = 718,446.02
  5. Step 5: Solve for x
    x = 718,446.02/779.18
  6. Step 6: Final answer
    x = 922.05

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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.