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Finding the Fourth Proportional to 1,259.39, 1,889.57 and 479.60

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Solution

The fourth proportional to 1,259.39, 1,889.57 and 479.60 is: 719.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.39 : 1,889.57 = 479.60 : x
  2. Step 2: Convert to fraction form
    1,259.39/1,889.57 = 479.60/x
  3. Step 3: Cross multiply
    1,259.39x = 1,889.57 × 479.60
  4. Step 4: Simplify right side
    1,259.39x = 906,237.77
  5. Step 5: Solve for x
    x = 906,237.77/1,259.39
  6. Step 6: Final answer
    x = 719.58

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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.