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Finding the Fourth Proportional to 770.80, 1,063.84 and 455.92

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Solution

The fourth proportional to 770.80, 1,063.84 and 455.92 is: 629.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.80 : 1,063.84 = 455.92 : x
  2. Step 2: Convert to fraction form
    770.80/1,063.84 = 455.92/x
  3. Step 3: Cross multiply
    770.80x = 1,063.84 × 455.92
  4. Step 4: Simplify right side
    770.80x = 485,025.93
  5. Step 5: Solve for x
    x = 485,025.93/770.80
  6. Step 6: Final answer
    x = 629.25

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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.