Home / 1,123.20-1,684.80-629.10

Finding the Fourth Proportional to 1,123.20, 1,684.80 and 629.10

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Solution

The fourth proportional to 1,123.20, 1,684.80 and 629.10 is: 943.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.20 : 1,684.80 = 629.10 : x
  2. Step 2: Convert to fraction form
    1,123.20/1,684.80 = 629.10/x
  3. Step 3: Cross multiply
    1,123.20x = 1,684.80 × 629.10
  4. Step 4: Simplify right side
    1,123.20x = 1,059,907.68
  5. Step 5: Solve for x
    x = 1,059,907.68/1,123.20
  6. Step 6: Final answer
    x = 943.65

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Similar ratio
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1.5x scale

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.