Home / 1,211.40-1,816.56-345.51

Finding the Fourth Proportional to 1,211.40, 1,816.56 and 345.51

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Solution

The fourth proportional to 1,211.40, 1,816.56 and 345.51 is: 518.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.40 : 1,816.56 = 345.51 : x
  2. Step 2: Convert to fraction form
    1,211.40/1,816.56 = 345.51/x
  3. Step 3: Cross multiply
    1,211.40x = 1,816.56 × 345.51
  4. Step 4: Simplify right side
    1,211.40x = 627,639.65
  5. Step 5: Solve for x
    x = 627,639.65/1,211.40
  6. Step 6: Final answer
    x = 518.11

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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.