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Finding the Fourth Proportional to 1,297.86, 1,791.12 and 1,210.38

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Solution

The fourth proportional to 1,297.86, 1,791.12 and 1,210.38 is: 1,670.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.86 : 1,791.12 = 1,210.38 : x
  2. Step 2: Convert to fraction form
    1,297.86/1,791.12 = 1,210.38/x
  3. Step 3: Cross multiply
    1,297.86x = 1,791.12 × 1,210.38
  4. Step 4: Simplify right side
    1,297.86x = 2,167,935.83
  5. Step 5: Solve for x
    x = 2,167,935.83/1,297.86
  6. Step 6: Final answer
    x = 1,670.39

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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.