Home / 1,858.90-2,788.81-1,312.15

Finding the Fourth Proportional to 1,858.90, 2,788.81 and 1,312.15

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Solution

The fourth proportional to 1,858.90, 2,788.81 and 1,312.15 is: 1,968.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858.90 : 2,788.81 = 1,312.15 : x
  2. Step 2: Convert to fraction form
    1,858.90/2,788.81 = 1,312.15/x
  3. Step 3: Cross multiply
    1,858.90x = 2,788.81 × 1,312.15
  4. Step 4: Simplify right side
    1,858.90x = 3,659,331.56
  5. Step 5: Solve for x
    x = 3,659,331.56/1,858.90
  6. Step 6: Final answer
    x = 1,968.55

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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.