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Finding the Fourth Proportional to 1,259.85, 1,889.78 and 479.67

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Solution

The fourth proportional to 1,259.85, 1,889.78 and 479.67 is: 719.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.85 : 1,889.78 = 479.67 : x
  2. Step 2: Convert to fraction form
    1,259.85/1,889.78 = 479.67/x
  3. Step 3: Cross multiply
    1,259.85x = 1,889.78 × 479.67
  4. Step 4: Simplify right side
    1,259.85x = 906,470.77
  5. Step 5: Solve for x
    x = 906,470.77/1,259.85
  6. Step 6: Final answer
    x = 719.51

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Similar ratio
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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.