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Finding the Fourth Proportional to 1,211.67, 1,817.60 and 390.33

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Solution

The fourth proportional to 1,211.67, 1,817.60 and 390.33 is: 585.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.67 : 1,817.60 = 390.33 : x
  2. Step 2: Convert to fraction form
    1,211.67/1,817.60 = 390.33/x
  3. Step 3: Cross multiply
    1,211.67x = 1,817.60 × 390.33
  4. Step 4: Simplify right side
    1,211.67x = 709,461.86
  5. Step 5: Solve for x
    x = 709,461.86/1,211.67
  6. Step 6: Final answer
    x = 585.52

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Half scale
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Double scale
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Similar ratio
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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.