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Finding the Fourth Proportional to 1,239.05, 1,858.18 and 448.31

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Solution

The fourth proportional to 1,239.05, 1,858.18 and 448.31 is: 672.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.05 : 1,858.18 = 448.31 : x
  2. Step 2: Convert to fraction form
    1,239.05/1,858.18 = 448.31/x
  3. Step 3: Cross multiply
    1,239.05x = 1,858.18 × 448.31
  4. Step 4: Simplify right side
    1,239.05x = 833,031.38
  5. Step 5: Solve for x
    x = 833,031.38/1,239.05
  6. Step 6: Final answer
    x = 672.32

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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.