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Finding the Fourth Proportional to 1,298.50, 1,791.63 and 767.45

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Solution

The fourth proportional to 1,298.50, 1,791.63 and 767.45 is: 1,058.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.50 : 1,791.63 = 767.45 : x
  2. Step 2: Convert to fraction form
    1,298.50/1,791.63 = 767.45/x
  3. Step 3: Cross multiply
    1,298.50x = 1,791.63 × 767.45
  4. Step 4: Simplify right side
    1,298.50x = 1,374,990.92
  5. Step 5: Solve for x
    x = 1,374,990.92/1,298.50
  6. Step 6: Final answer
    x = 1,058.91

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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.