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Finding the Fourth Proportional to 776.93, 1,072.19 and 445.35

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Solution

The fourth proportional to 776.93, 1,072.19 and 445.35 is: 614.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.93 : 1,072.19 = 445.35 : x
  2. Step 2: Convert to fraction form
    776.93/1,072.19 = 445.35/x
  3. Step 3: Cross multiply
    776.93x = 1,072.19 × 445.35
  4. Step 4: Simplify right side
    776.93x = 477,499.82
  5. Step 5: Solve for x
    x = 477,499.82/776.93
  6. Step 6: Final answer
    x = 614.60

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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.