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Finding the Fourth Proportional to 1,091.65, 1,625.13 and 1,085.16

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Solution

The fourth proportional to 1,091.65, 1,625.13 and 1,085.16 is: 1,615.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.65 : 1,625.13 = 1,085.16 : x
  2. Step 2: Convert to fraction form
    1,091.65/1,625.13 = 1,085.16/x
  3. Step 3: Cross multiply
    1,091.65x = 1,625.13 × 1,085.16
  4. Step 4: Simplify right side
    1,091.65x = 1,763,520.65
  5. Step 5: Solve for x
    x = 1,763,520.65/1,091.65
  6. Step 6: Final answer
    x = 1,615.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.