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Finding the Fourth Proportional to 1,298.58, 1,791.99 and 738.98

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Solution

The fourth proportional to 1,298.58, 1,791.99 and 738.98 is: 1,019.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.58 : 1,791.99 = 738.98 : x
  2. Step 2: Convert to fraction form
    1,298.58/1,791.99 = 738.98/x
  3. Step 3: Cross multiply
    1,298.58x = 1,791.99 × 738.98
  4. Step 4: Simplify right side
    1,298.58x = 1,324,235.81
  5. Step 5: Solve for x
    x = 1,324,235.81/1,298.58
  6. Step 6: Final answer
    x = 1,019.76

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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.