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Finding the Fourth Proportional to 1,211.65, 1,816.94 and 345.76

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Solution

The fourth proportional to 1,211.65, 1,816.94 and 345.76 is: 518.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.65 : 1,816.94 = 345.76 : x
  2. Step 2: Convert to fraction form
    1,211.65/1,816.94 = 345.76/x
  3. Step 3: Cross multiply
    1,211.65x = 1,816.94 × 345.76
  4. Step 4: Simplify right side
    1,211.65x = 628,223.45
  5. Step 5: Solve for x
    x = 628,223.45/1,211.65
  6. Step 6: Final answer
    x = 518.49

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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.