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Finding the Fourth Proportional to 1,123.12, 1,684.81 and 382.85

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Solution

The fourth proportional to 1,123.12, 1,684.81 and 382.85 is: 574.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.12 : 1,684.81 = 382.85 : x
  2. Step 2: Convert to fraction form
    1,123.12/1,684.81 = 382.85/x
  3. Step 3: Cross multiply
    1,123.12x = 1,684.81 × 382.85
  4. Step 4: Simplify right side
    1,123.12x = 645,029.51
  5. Step 5: Solve for x
    x = 645,029.51/1,123.12
  6. Step 6: Final answer
    x = 574.32

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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.