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Finding the Fourth Proportional to 779.90, 1,074.06 and 669.33

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Solution

The fourth proportional to 779.90, 1,074.06 and 669.33 is: 921.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.90 : 1,074.06 = 669.33 : x
  2. Step 2: Convert to fraction form
    779.90/1,074.06 = 669.33/x
  3. Step 3: Cross multiply
    779.90x = 1,074.06 × 669.33
  4. Step 4: Simplify right side
    779.90x = 718,900.58
  5. Step 5: Solve for x
    x = 718,900.58/779.90
  6. Step 6: Final answer
    x = 921.79

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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.