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Finding the Fourth Proportional to 777.12, 1,072.38 and 445.47

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Solution

The fourth proportional to 777.12, 1,072.38 and 445.47 is: 614.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.12 : 1,072.38 = 445.47 : x
  2. Step 2: Convert to fraction form
    777.12/1,072.38 = 445.47/x
  3. Step 3: Cross multiply
    777.12x = 1,072.38 × 445.47
  4. Step 4: Simplify right side
    777.12x = 477,713.12
  5. Step 5: Solve for x
    x = 477,713.12/777.12
  6. Step 6: Final answer
    x = 614.72

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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.