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Finding the Fourth Proportional to 1,297.36, 1,790.40 and 707.93

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Solution

The fourth proportional to 1,297.36, 1,790.40 and 707.93 is: 976.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.36 : 1,790.40 = 707.93 : x
  2. Step 2: Convert to fraction form
    1,297.36/1,790.40 = 707.93/x
  3. Step 3: Cross multiply
    1,297.36x = 1,790.40 × 707.93
  4. Step 4: Simplify right side
    1,297.36x = 1,267,477.87
  5. Step 5: Solve for x
    x = 1,267,477.87/1,297.36
  6. Step 6: Final answer
    x = 976.97

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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.