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Finding the Fourth Proportional to 1,106.65, 1,659.97 and 619.43

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Solution

The fourth proportional to 1,106.65, 1,659.97 and 619.43 is: 929.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,106.65 : 1,659.97 = 619.43 : x
  2. Step 2: Convert to fraction form
    1,106.65/1,659.97 = 619.43/x
  3. Step 3: Cross multiply
    1,106.65x = 1,659.97 × 619.43
  4. Step 4: Simplify right side
    1,106.65x = 1,028,235.22
  5. Step 5: Solve for x
    x = 1,028,235.22/1,106.65
  6. Step 6: Final answer
    x = 929.15

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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.