Home / 1,211.29-1,816.89-345.60

Finding the Fourth Proportional to 1,211.29, 1,816.89 and 345.60

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Solution

The fourth proportional to 1,211.29, 1,816.89 and 345.60 is: 518.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.29 : 1,816.89 = 345.60 : x
  2. Step 2: Convert to fraction form
    1,211.29/1,816.89 = 345.60/x
  3. Step 3: Cross multiply
    1,211.29x = 1,816.89 × 345.60
  4. Step 4: Simplify right side
    1,211.29x = 627,917.18
  5. Step 5: Solve for x
    x = 627,917.18/1,211.29
  6. Step 6: Final answer
    x = 518.39

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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.