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Finding the Fourth Proportional to 1,298.96, 1,791.68 and 774.80

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Solution

The fourth proportional to 1,298.96, 1,791.68 and 774.80 is: 1,068.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.96 : 1,791.68 = 774.80 : x
  2. Step 2: Convert to fraction form
    1,298.96/1,791.68 = 774.80/x
  3. Step 3: Cross multiply
    1,298.96x = 1,791.68 × 774.80
  4. Step 4: Simplify right side
    1,298.96x = 1,388,193.66
  5. Step 5: Solve for x
    x = 1,388,193.66/1,298.96
  6. Step 6: Final answer
    x = 1,068.70

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1.5x scale

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.