Home / 2,115-2,918.70-1,230.75

Finding the Fourth Proportional to 2,115, 2,918.70 and 1,230.75

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Solution

The fourth proportional to 2,115, 2,918.70 and 1,230.75 is: 1,698.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115 : 2,918.70 = 1,230.75 : x
  2. Step 2: Convert to fraction form
    2,115/2,918.70 = 1,230.75/x
  3. Step 3: Cross multiply
    2,115x = 2,918.70 × 1,230.75
  4. Step 4: Simplify right side
    2,115x = 3,592,190.03
  5. Step 5: Solve for x
    x = 3,592,190.03/2,115
  6. Step 6: Final answer
    x = 1,698.44

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.