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Finding the Fourth Proportional to 1,639.63, 2,459.85 and 666.01

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Solution

The fourth proportional to 1,639.63, 2,459.85 and 666.01 is: 999.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.63 : 2,459.85 = 666.01 : x
  2. Step 2: Convert to fraction form
    1,639.63/2,459.85 = 666.01/x
  3. Step 3: Cross multiply
    1,639.63x = 2,459.85 × 666.01
  4. Step 4: Simplify right side
    1,639.63x = 1,638,284.70
  5. Step 5: Solve for x
    x = 1,638,284.70/1,639.63
  6. Step 6: Final answer
    x = 999.18

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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.