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Finding the Fourth Proportional to 1,121.46, 1,682.32 and 390.97

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Solution

The fourth proportional to 1,121.46, 1,682.32 and 390.97 is: 586.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.46 : 1,682.32 = 390.97 : x
  2. Step 2: Convert to fraction form
    1,121.46/1,682.32 = 390.97/x
  3. Step 3: Cross multiply
    1,121.46x = 1,682.32 × 390.97
  4. Step 4: Simplify right side
    1,121.46x = 657,736.65
  5. Step 5: Solve for x
    x = 657,736.65/1,121.46
  6. Step 6: Final answer
    x = 586.50

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Half scale
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Double scale
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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.