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Finding the Fourth Proportional to 1,241, 1,715.78 and 1,186.60

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Solution

The fourth proportional to 1,241, 1,715.78 and 1,186.60 is: 1,640.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,241 : 1,715.78 = 1,186.60 : x
  2. Step 2: Convert to fraction form
    1,241/1,715.78 = 1,186.60/x
  3. Step 3: Cross multiply
    1,241x = 1,715.78 × 1,186.60
  4. Step 4: Simplify right side
    1,241x = 2,035,944.55
  5. Step 5: Solve for x
    x = 2,035,944.55/1,241
  6. Step 6: Final answer
    x = 1,640.57

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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.