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Finding the Fourth Proportional to 1,639.72, 2,459.88 and 666.50

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Solution

The fourth proportional to 1,639.72, 2,459.88 and 666.50 is: 999.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.72 : 2,459.88 = 666.50 : x
  2. Step 2: Convert to fraction form
    1,639.72/2,459.88 = 666.50/x
  3. Step 3: Cross multiply
    1,639.72x = 2,459.88 × 666.50
  4. Step 4: Simplify right side
    1,639.72x = 1,639,516.17
  5. Step 5: Solve for x
    x = 1,639,516.17/1,639.72
  6. Step 6: Final answer
    x = 999.88

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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.