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Finding the Fourth Proportional to 1,259.29, 1,889.68 and 479.39

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Solution

The fourth proportional to 1,259.29, 1,889.68 and 479.39 is: 719.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.29 : 1,889.68 = 479.39 : x
  2. Step 2: Convert to fraction form
    1,259.29/1,889.68 = 479.39/x
  3. Step 3: Cross multiply
    1,259.29x = 1,889.68 × 479.39
  4. Step 4: Simplify right side
    1,259.29x = 905,893.70
  5. Step 5: Solve for x
    x = 905,893.70/1,259.29
  6. Step 6: Final answer
    x = 719.37

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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.