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Finding the Fourth Proportional to 1,138.71, 1,706.80 and 650.69

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Solution

The fourth proportional to 1,138.71, 1,706.80 and 650.69 is: 975.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.71 : 1,706.80 = 650.69 : x
  2. Step 2: Convert to fraction form
    1,138.71/1,706.80 = 650.69/x
  3. Step 3: Cross multiply
    1,138.71x = 1,706.80 × 650.69
  4. Step 4: Simplify right side
    1,138.71x = 1,110,597.69
  5. Step 5: Solve for x
    x = 1,110,597.69/1,138.71
  6. Step 6: Final answer
    x = 975.31

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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.