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Finding the Fourth Proportional to 777.61, 1,072.83 and 445.92

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Solution

The fourth proportional to 777.61, 1,072.83 and 445.92 is: 615.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.61 : 1,072.83 = 445.92 : x
  2. Step 2: Convert to fraction form
    777.61/1,072.83 = 445.92/x
  3. Step 3: Cross multiply
    777.61x = 1,072.83 × 445.92
  4. Step 4: Simplify right side
    777.61x = 478,396.35
  5. Step 5: Solve for x
    x = 478,396.35/777.61
  6. Step 6: Final answer
    x = 615.21

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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.