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Finding the Fourth Proportional to 1,239.58, 1,859.70 and 459.68

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Solution

The fourth proportional to 1,239.58, 1,859.70 and 459.68 is: 689.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.58 : 1,859.70 = 459.68 : x
  2. Step 2: Convert to fraction form
    1,239.58/1,859.70 = 459.68/x
  3. Step 3: Cross multiply
    1,239.58x = 1,859.70 × 459.68
  4. Step 4: Simplify right side
    1,239.58x = 854,866.90
  5. Step 5: Solve for x
    x = 854,866.90/1,239.58
  6. Step 6: Final answer
    x = 689.64

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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.