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Finding the Fourth Proportional to 778.14, 1,072.95 and 637.81

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Solution

The fourth proportional to 778.14, 1,072.95 and 637.81 is: 879.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.14 : 1,072.95 = 637.81 : x
  2. Step 2: Convert to fraction form
    778.14/1,072.95 = 637.81/x
  3. Step 3: Cross multiply
    778.14x = 1,072.95 × 637.81
  4. Step 4: Simplify right side
    778.14x = 684,333.17
  5. Step 5: Solve for x
    x = 684,333.17/778.14
  6. Step 6: Final answer
    x = 879.45

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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.