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Finding the Fourth Proportional to 1,239.14, 1,858.19 and 458.98

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Solution

The fourth proportional to 1,239.14, 1,858.19 and 458.98 is: 688.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.14 : 1,858.19 = 458.98 : x
  2. Step 2: Convert to fraction form
    1,239.14/1,858.19 = 458.98/x
  3. Step 3: Cross multiply
    1,239.14x = 1,858.19 × 458.98
  4. Step 4: Simplify right side
    1,239.14x = 852,872.05
  5. Step 5: Solve for x
    x = 852,872.05/1,239.14
  6. Step 6: Final answer
    x = 688.28

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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.