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Finding the Fourth Proportional to 1,220.63, 1,684.46 and 696.67

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Solution

The fourth proportional to 1,220.63, 1,684.46 and 696.67 is: 961.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.63 : 1,684.46 = 696.67 : x
  2. Step 2: Convert to fraction form
    1,220.63/1,684.46 = 696.67/x
  3. Step 3: Cross multiply
    1,220.63x = 1,684.46 × 696.67
  4. Step 4: Simplify right side
    1,220.63x = 1,173,510.28
  5. Step 5: Solve for x
    x = 1,173,510.28/1,220.63
  6. Step 6: Final answer
    x = 961.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.