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Finding the Fourth Proportional to 1,238.62, 1,858.65 and 459.17

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Solution

The fourth proportional to 1,238.62, 1,858.65 and 459.17 is: 689.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.62 : 1,858.65 = 459.17 : x
  2. Step 2: Convert to fraction form
    1,238.62/1,858.65 = 459.17/x
  3. Step 3: Cross multiply
    1,238.62x = 1,858.65 × 459.17
  4. Step 4: Simplify right side
    1,238.62x = 853,436.32
  5. Step 5: Solve for x
    x = 853,436.32/1,238.62
  6. Step 6: Final answer
    x = 689.02

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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.