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Finding the Fourth Proportional to 779.55, 1,074.73 and 646.27

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Solution

The fourth proportional to 779.55, 1,074.73 and 646.27 is: 890.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.55 : 1,074.73 = 646.27 : x
  2. Step 2: Convert to fraction form
    779.55/1,074.73 = 646.27/x
  3. Step 3: Cross multiply
    779.55x = 1,074.73 × 646.27
  4. Step 4: Simplify right side
    779.55x = 694,565.76
  5. Step 5: Solve for x
    x = 694,565.76/779.55
  6. Step 6: Final answer
    x = 890.98

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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.