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Finding the Fourth Proportional to 520.81, 779.80 and 455.17

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Solution

The fourth proportional to 520.81, 779.80 and 455.17 is: 681.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.81 : 779.80 = 455.17 : x
  2. Step 2: Convert to fraction form
    520.81/779.80 = 455.17/x
  3. Step 3: Cross multiply
    520.81x = 779.80 × 455.17
  4. Step 4: Simplify right side
    520.81x = 354,941.57
  5. Step 5: Solve for x
    x = 354,941.57/520.81
  6. Step 6: Final answer
    x = 681.52

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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.