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Finding the Fourth Proportional to 1,639.43, 2,460.05 and 666.21

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Solution

The fourth proportional to 1,639.43, 2,460.05 and 666.21 is: 999.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.43 : 2,460.05 = 666.21 : x
  2. Step 2: Convert to fraction form
    1,639.43/2,460.05 = 666.21/x
  3. Step 3: Cross multiply
    1,639.43x = 2,460.05 × 666.21
  4. Step 4: Simplify right side
    1,639.43x = 1,638,909.91
  5. Step 5: Solve for x
    x = 1,638,909.91/1,639.43
  6. Step 6: Final answer
    x = 999.68

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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.