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Finding the Fourth Proportional to 1,298.65, 1,791.43 and 774.31

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Solution

The fourth proportional to 1,298.65, 1,791.43 and 774.31 is: 1,068.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.65 : 1,791.43 = 774.31 : x
  2. Step 2: Convert to fraction form
    1,298.65/1,791.43 = 774.31/x
  3. Step 3: Cross multiply
    1,298.65x = 1,791.43 × 774.31
  4. Step 4: Simplify right side
    1,298.65x = 1,387,122.16
  5. Step 5: Solve for x
    x = 1,387,122.16/1,298.65
  6. Step 6: Final answer
    x = 1,068.13

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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.