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Finding the Fourth Proportional to 1,185.22, 1,774.38 and 690.11

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Solution

The fourth proportional to 1,185.22, 1,774.38 and 690.11 is: 1,033.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.22 : 1,774.38 = 690.11 : x
  2. Step 2: Convert to fraction form
    1,185.22/1,774.38 = 690.11/x
  3. Step 3: Cross multiply
    1,185.22x = 1,774.38 × 690.11
  4. Step 4: Simplify right side
    1,185.22x = 1,224,521.45
  5. Step 5: Solve for x
    x = 1,224,521.45/1,185.22
  6. Step 6: Final answer
    x = 1,033.16

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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.