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Finding the Fourth Proportional to 1,313.19, 1,969.37 and 619.44

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Solution

The fourth proportional to 1,313.19, 1,969.37 and 619.44 is: 928.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.19 : 1,969.37 = 619.44 : x
  2. Step 2: Convert to fraction form
    1,313.19/1,969.37 = 619.44/x
  3. Step 3: Cross multiply
    1,313.19x = 1,969.37 × 619.44
  4. Step 4: Simplify right side
    1,313.19x = 1,219,903.46
  5. Step 5: Solve for x
    x = 1,219,903.46/1,313.19
  6. Step 6: Final answer
    x = 928.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.