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Finding the Fourth Proportional to 1,639.50, 2,457.89 and 666.29

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Solution

The fourth proportional to 1,639.50, 2,457.89 and 666.29 is: 998.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.50 : 2,457.89 = 666.29 : x
  2. Step 2: Convert to fraction form
    1,639.50/2,457.89 = 666.29/x
  3. Step 3: Cross multiply
    1,639.50x = 2,457.89 × 666.29
  4. Step 4: Simplify right side
    1,639.50x = 1,637,651.91
  5. Step 5: Solve for x
    x = 1,637,651.91/1,639.50
  6. Step 6: Final answer
    x = 998.87

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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.