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Finding the Fourth Proportional to 940.86, 1,297.71 and 629.82

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Solution

The fourth proportional to 940.86, 1,297.71 and 629.82 is: 868.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.86 : 1,297.71 = 629.82 : x
  2. Step 2: Convert to fraction form
    940.86/1,297.71 = 629.82/x
  3. Step 3: Cross multiply
    940.86x = 1,297.71 × 629.82
  4. Step 4: Simplify right side
    940.86x = 817,323.71
  5. Step 5: Solve for x
    x = 817,323.71/940.86
  6. Step 6: Final answer
    x = 868.70

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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.