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Finding the Fourth Proportional to 1,298.45, 1,791.56 and 774.38

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Solution

The fourth proportional to 1,298.45, 1,791.56 and 774.38 is: 1,068.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.45 : 1,791.56 = 774.38 : x
  2. Step 2: Convert to fraction form
    1,298.45/1,791.56 = 774.38/x
  3. Step 3: Cross multiply
    1,298.45x = 1,791.56 × 774.38
  4. Step 4: Simplify right side
    1,298.45x = 1,387,341.21
  5. Step 5: Solve for x
    x = 1,387,341.21/1,298.45
  6. Step 6: Final answer
    x = 1,068.46

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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.