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Finding the Fourth Proportional to 1,339.94, 1,848.19 and 1,229.78

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Solution

The fourth proportional to 1,339.94, 1,848.19 and 1,229.78 is: 1,696.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.94 : 1,848.19 = 1,229.78 : x
  2. Step 2: Convert to fraction form
    1,339.94/1,848.19 = 1,229.78/x
  3. Step 3: Cross multiply
    1,339.94x = 1,848.19 × 1,229.78
  4. Step 4: Simplify right side
    1,339.94x = 2,272,867.10
  5. Step 5: Solve for x
    x = 2,272,867.10/1,339.94
  6. Step 6: Final answer
    x = 1,696.25

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Half scale
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Double scale
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Similar ratio
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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.