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Finding the Fourth Proportional to 3,139, 4,708.50 and 1,087

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Solution

The fourth proportional to 3,139, 4,708.50 and 1,087 is: 1,630.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139 : 4,708.50 = 1,087 : x
  2. Step 2: Convert to fraction form
    3,139/4,708.50 = 1,087/x
  3. Step 3: Cross multiply
    3,139x = 4,708.50 × 1,087
  4. Step 4: Simplify right side
    3,139x = 5,118,139.50
  5. Step 5: Solve for x
    x = 5,118,139.50/3,139
  6. Step 6: Final answer
    x = 1,630.50

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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.