Home / 1,987.10-2,787.70-1,987.10

Finding the Fourth Proportional to 1,987.10, 2,787.70 and 1,987.10

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Solution

The fourth proportional to 1,987.10, 2,787.70 and 1,987.10 is: 2,787.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.10 : 2,787.70 = 1,987.10 : x
  2. Step 2: Convert to fraction form
    1,987.10/2,787.70 = 1,987.10/x
  3. Step 3: Cross multiply
    1,987.10x = 2,787.70 × 1,987.10
  4. Step 4: Simplify right side
    1,987.10x = 5,539,438.67
  5. Step 5: Solve for x
    x = 5,539,438.67/1,987.10
  6. Step 6: Final answer
    x = 2,787.70

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.