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Finding the Fourth Proportional to 1,619.28, 2,428.96 and 693.88

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Solution

The fourth proportional to 1,619.28, 2,428.96 and 693.88 is: 1,040.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,619.28 : 2,428.96 = 693.88 : x
  2. Step 2: Convert to fraction form
    1,619.28/2,428.96 = 693.88/x
  3. Step 3: Cross multiply
    1,619.28x = 2,428.96 × 693.88
  4. Step 4: Simplify right side
    1,619.28x = 1,685,406.76
  5. Step 5: Solve for x
    x = 1,685,406.76/1,619.28
  6. Step 6: Final answer
    x = 1,040.84

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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.