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Finding the Fourth Proportional to 1,049.70, 1,576.80 and 639.06

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Solution

The fourth proportional to 1,049.70, 1,576.80 and 639.06 is: 959.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,049.70 : 1,576.80 = 639.06 : x
  2. Step 2: Convert to fraction form
    1,049.70/1,576.80 = 639.06/x
  3. Step 3: Cross multiply
    1,049.70x = 1,576.80 × 639.06
  4. Step 4: Simplify right side
    1,049.70x = 1,007,669.81
  5. Step 5: Solve for x
    x = 1,007,669.81/1,049.70
  6. Step 6: Final answer
    x = 959.96

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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.