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Finding the Fourth Proportional to 1,239.70, 1,857.90 and 458.98

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Solution

The fourth proportional to 1,239.70, 1,857.90 and 458.98 is: 687.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.70 : 1,857.90 = 458.98 : x
  2. Step 2: Convert to fraction form
    1,239.70/1,857.90 = 458.98/x
  3. Step 3: Cross multiply
    1,239.70x = 1,857.90 × 458.98
  4. Step 4: Simplify right side
    1,239.70x = 852,738.94
  5. Step 5: Solve for x
    x = 852,738.94/1,239.70
  6. Step 6: Final answer
    x = 687.86

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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.