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Finding the Fourth Proportional to 1,074.65, 1,609.91 and 911.93

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Solution

The fourth proportional to 1,074.65, 1,609.91 and 911.93 is: 1,366.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.65 : 1,609.91 = 911.93 : x
  2. Step 2: Convert to fraction form
    1,074.65/1,609.91 = 911.93/x
  3. Step 3: Cross multiply
    1,074.65x = 1,609.91 × 911.93
  4. Step 4: Simplify right side
    1,074.65x = 1,468,120.67
  5. Step 5: Solve for x
    x = 1,468,120.67/1,074.65
  6. Step 6: Final answer
    x = 1,366.14

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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.