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Finding the Fourth Proportional to 3,139, 4,331 and 1,812.40

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Solution

The fourth proportional to 3,139, 4,331 and 1,812.40 is: 2,500.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139 : 4,331 = 1,812.40 : x
  2. Step 2: Convert to fraction form
    3,139/4,331 = 1,812.40/x
  3. Step 3: Cross multiply
    3,139x = 4,331 × 1,812.40
  4. Step 4: Simplify right side
    3,139x = 7,849,504.40
  5. Step 5: Solve for x
    x = 7,849,504.40/3,139
  6. Step 6: Final answer
    x = 2,500.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.