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Finding the Fourth Proportional to 1,313.44, 1,814.86 and 939.76

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Solution

The fourth proportional to 1,313.44, 1,814.86 and 939.76 is: 1,298.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.44 : 1,814.86 = 939.76 : x
  2. Step 2: Convert to fraction form
    1,313.44/1,814.86 = 939.76/x
  3. Step 3: Cross multiply
    1,313.44x = 1,814.86 × 939.76
  4. Step 4: Simplify right side
    1,313.44x = 1,705,532.83
  5. Step 5: Solve for x
    x = 1,705,532.83/1,313.44
  6. Step 6: Final answer
    x = 1,298.52

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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.