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Finding the Fourth Proportional to 1,186.11, 1,636.80 and 662.13

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Solution

The fourth proportional to 1,186.11, 1,636.80 and 662.13 is: 913.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.11 : 1,636.80 = 662.13 : x
  2. Step 2: Convert to fraction form
    1,186.11/1,636.80 = 662.13/x
  3. Step 3: Cross multiply
    1,186.11x = 1,636.80 × 662.13
  4. Step 4: Simplify right side
    1,186.11x = 1,083,774.38
  5. Step 5: Solve for x
    x = 1,083,774.38/1,186.11
  6. Step 6: Final answer
    x = 913.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.