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Finding the Fourth Proportional to 1,238.67, 1,858.29 and 718.53

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Solution

The fourth proportional to 1,238.67, 1,858.29 and 718.53 is: 1,077.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.67 : 1,858.29 = 718.53 : x
  2. Step 2: Convert to fraction form
    1,238.67/1,858.29 = 718.53/x
  3. Step 3: Cross multiply
    1,238.67x = 1,858.29 × 718.53
  4. Step 4: Simplify right side
    1,238.67x = 1,335,237.11
  5. Step 5: Solve for x
    x = 1,335,237.11/1,238.67
  6. Step 6: Final answer
    x = 1,077.96

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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.