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Finding the Fourth Proportional to 777.21, 1,072.59 and 445.61

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Solution

The fourth proportional to 777.21, 1,072.59 and 445.61 is: 614.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.21 : 1,072.59 = 445.61 : x
  2. Step 2: Convert to fraction form
    777.21/1,072.59 = 445.61/x
  3. Step 3: Cross multiply
    777.21x = 1,072.59 × 445.61
  4. Step 4: Simplify right side
    777.21x = 477,954.60
  5. Step 5: Solve for x
    x = 477,954.60/777.21
  6. Step 6: Final answer
    x = 614.96

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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.