Home / 1,211.25-1,816.95-345.63

Finding the Fourth Proportional to 1,211.25, 1,816.95 and 345.63

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Solution

The fourth proportional to 1,211.25, 1,816.95 and 345.63 is: 518.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.25 : 1,816.95 = 345.63 : x
  2. Step 2: Convert to fraction form
    1,211.25/1,816.95 = 345.63/x
  3. Step 3: Cross multiply
    1,211.25x = 1,816.95 × 345.63
  4. Step 4: Simplify right side
    1,211.25x = 627,992.43
  5. Step 5: Solve for x
    x = 627,992.43/1,211.25
  6. Step 6: Final answer
    x = 518.47

Related Problems

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