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Finding the Fourth Proportional to 777.27, 1,072.65 and 445.87

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Solution

The fourth proportional to 777.27, 1,072.65 and 445.87 is: 615.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.27 : 1,072.65 = 445.87 : x
  2. Step 2: Convert to fraction form
    777.27/1,072.65 = 445.87/x
  3. Step 3: Cross multiply
    777.27x = 1,072.65 × 445.87
  4. Step 4: Simplify right side
    777.27x = 478,262.46
  5. Step 5: Solve for x
    x = 478,262.46/777.27
  6. Step 6: Final answer
    x = 615.31

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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.