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Finding the Fourth Proportional to 779.61, 1,074.63 and 558.27

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Solution

The fourth proportional to 779.61, 1,074.63 and 558.27 is: 769.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.61 : 1,074.63 = 558.27 : x
  2. Step 2: Convert to fraction form
    779.61/1,074.63 = 558.27/x
  3. Step 3: Cross multiply
    779.61x = 1,074.63 × 558.27
  4. Step 4: Simplify right side
    779.61x = 599,933.69
  5. Step 5: Solve for x
    x = 599,933.69/779.61
  6. Step 6: Final answer
    x = 769.53

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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.