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Finding the Fourth Proportional to 779.42, 1,170.65 and 573.18

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Solution

The fourth proportional to 779.42, 1,170.65 and 573.18 is: 860.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.42 : 1,170.65 = 573.18 : x
  2. Step 2: Convert to fraction form
    779.42/1,170.65 = 573.18/x
  3. Step 3: Cross multiply
    779.42x = 1,170.65 × 573.18
  4. Step 4: Simplify right side
    779.42x = 670,990.21
  5. Step 5: Solve for x
    x = 670,990.21/779.42
  6. Step 6: Final answer
    x = 860.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.