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Finding the Fourth Proportional to 1,138.20, 1,706.66 and 479.37

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Solution

The fourth proportional to 1,138.20, 1,706.66 and 479.37 is: 718.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.20 : 1,706.66 = 479.37 : x
  2. Step 2: Convert to fraction form
    1,138.20/1,706.66 = 479.37/x
  3. Step 3: Cross multiply
    1,138.20x = 1,706.66 × 479.37
  4. Step 4: Simplify right side
    1,138.20x = 818,113.07
  5. Step 5: Solve for x
    x = 818,113.07/1,138.20
  6. Step 6: Final answer
    x = 718.78

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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.