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Finding the Fourth Proportional to 1,234.25, 1,851.21 and 412.51

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Solution

The fourth proportional to 1,234.25, 1,851.21 and 412.51 is: 618.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,234.25 : 1,851.21 = 412.51 : x
  2. Step 2: Convert to fraction form
    1,234.25/1,851.21 = 412.51/x
  3. Step 3: Cross multiply
    1,234.25x = 1,851.21 × 412.51
  4. Step 4: Simplify right side
    1,234.25x = 763,642.64
  5. Step 5: Solve for x
    x = 763,642.64/1,234.25
  6. Step 6: Final answer
    x = 618.71

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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.