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Finding the Fourth Proportional to 1,238.61, 1,709.01 and 741.18

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Solution

The fourth proportional to 1,238.61, 1,709.01 and 741.18 is: 1,022.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.61 : 1,709.01 = 741.18 : x
  2. Step 2: Convert to fraction form
    1,238.61/1,709.01 = 741.18/x
  3. Step 3: Cross multiply
    1,238.61x = 1,709.01 × 741.18
  4. Step 4: Simplify right side
    1,238.61x = 1,266,684.03
  5. Step 5: Solve for x
    x = 1,266,684.03/1,238.61
  6. Step 6: Final answer
    x = 1,022.67

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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.