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Finding the Fourth Proportional to 1,214.67, 1,821.30 and 666.72

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Solution

The fourth proportional to 1,214.67, 1,821.30 and 666.72 is: 999.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.67 : 1,821.30 = 666.72 : x
  2. Step 2: Convert to fraction form
    1,214.67/1,821.30 = 666.72/x
  3. Step 3: Cross multiply
    1,214.67x = 1,821.30 × 666.72
  4. Step 4: Simplify right side
    1,214.67x = 1,214,297.14
  5. Step 5: Solve for x
    x = 1,214,297.14/1,214.67
  6. Step 6: Final answer
    x = 999.69

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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.