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Finding the Fourth Proportional to 1,214.31, 1,820.75 and 666.35

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Solution

The fourth proportional to 1,214.31, 1,820.75 and 666.35 is: 999.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.31 : 1,820.75 = 666.35 : x
  2. Step 2: Convert to fraction form
    1,214.31/1,820.75 = 666.35/x
  3. Step 3: Cross multiply
    1,214.31x = 1,820.75 × 666.35
  4. Step 4: Simplify right side
    1,214.31x = 1,213,244.33
  5. Step 5: Solve for x
    x = 1,213,244.33/1,214.31
  6. Step 6: Final answer
    x = 999.12

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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.