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Finding the Fourth Proportional to 1,242.12, 1,861.74 and 657.69

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Solution

The fourth proportional to 1,242.12, 1,861.74 and 657.69 is: 985.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.12 : 1,861.74 = 657.69 : x
  2. Step 2: Convert to fraction form
    1,242.12/1,861.74 = 657.69/x
  3. Step 3: Cross multiply
    1,242.12x = 1,861.74 × 657.69
  4. Step 4: Simplify right side
    1,242.12x = 1,224,447.78
  5. Step 5: Solve for x
    x = 1,224,447.78/1,242.12
  6. Step 6: Final answer
    x = 985.77

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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.