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Finding the Fourth Proportional to 1,238.43, 1,858.58 and 458.91

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Solution

The fourth proportional to 1,238.43, 1,858.58 and 458.91 is: 688.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.43 : 1,858.58 = 458.91 : x
  2. Step 2: Convert to fraction form
    1,238.43/1,858.58 = 458.91/x
  3. Step 3: Cross multiply
    1,238.43x = 1,858.58 × 458.91
  4. Step 4: Simplify right side
    1,238.43x = 852,911.65
  5. Step 5: Solve for x
    x = 852,911.65/1,238.43
  6. Step 6: Final answer
    x = 688.70

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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.