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Finding the Fourth Proportional to 776.86, 1,072.10 and 445.39

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Solution

The fourth proportional to 776.86, 1,072.10 and 445.39 is: 614.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.86 : 1,072.10 = 445.39 : x
  2. Step 2: Convert to fraction form
    776.86/1,072.10 = 445.39/x
  3. Step 3: Cross multiply
    776.86x = 1,072.10 × 445.39
  4. Step 4: Simplify right side
    776.86x = 477,501.05
  5. Step 5: Solve for x
    x = 477,501.05/776.86
  6. Step 6: Final answer
    x = 614.66

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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.