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Finding the Fourth Proportional to 1,238.69, 1,858.06 and 405.76

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Solution

The fourth proportional to 1,238.69, 1,858.06 and 405.76 is: 608.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.69 : 1,858.06 = 405.76 : x
  2. Step 2: Convert to fraction form
    1,238.69/1,858.06 = 405.76/x
  3. Step 3: Cross multiply
    1,238.69x = 1,858.06 × 405.76
  4. Step 4: Simplify right side
    1,238.69x = 753,926.91
  5. Step 5: Solve for x
    x = 753,926.91/1,238.69
  6. Step 6: Final answer
    x = 608.65

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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.