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Finding the Fourth Proportional to 1,259.61, 1,889.26 and 479.27

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Solution

The fourth proportional to 1,259.61, 1,889.26 and 479.27 is: 718.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.61 : 1,889.26 = 479.27 : x
  2. Step 2: Convert to fraction form
    1,259.61/1,889.26 = 479.27/x
  3. Step 3: Cross multiply
    1,259.61x = 1,889.26 × 479.27
  4. Step 4: Simplify right side
    1,259.61x = 905,469.17
  5. Step 5: Solve for x
    x = 905,469.17/1,259.61
  6. Step 6: Final answer
    x = 718.85

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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.