Home / 1,551.20-2,139.72-1,219.10

Finding the Fourth Proportional to 1,551.20, 2,139.72 and 1,219.10

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Solution

The fourth proportional to 1,551.20, 2,139.72 and 1,219.10 is: 1,681.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,551.20 : 2,139.72 = 1,219.10 : x
  2. Step 2: Convert to fraction form
    1,551.20/2,139.72 = 1,219.10/x
  3. Step 3: Cross multiply
    1,551.20x = 2,139.72 × 1,219.10
  4. Step 4: Simplify right side
    1,551.20x = 2,608,532.65
  5. Step 5: Solve for x
    x = 2,608,532.65/1,551.20
  6. Step 6: Final answer
    x = 1,681.62

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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.