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Finding the Fourth Proportional to 1,220.98, 1,684.76 and 689.80

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Solution

The fourth proportional to 1,220.98, 1,684.76 and 689.80 is: 951.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.98 : 1,684.76 = 689.80 : x
  2. Step 2: Convert to fraction form
    1,220.98/1,684.76 = 689.80/x
  3. Step 3: Cross multiply
    1,220.98x = 1,684.76 × 689.80
  4. Step 4: Simplify right side
    1,220.98x = 1,162,147.45
  5. Step 5: Solve for x
    x = 1,162,147.45/1,220.98
  6. Step 6: Final answer
    x = 951.82

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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.