Home / 2,987.15-4,121.28-1,807.79

Finding the Fourth Proportional to 2,987.15, 4,121.28 and 1,807.79

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Solution

The fourth proportional to 2,987.15, 4,121.28 and 1,807.79 is: 2,494.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.15 : 4,121.28 = 1,807.79 : x
  2. Step 2: Convert to fraction form
    2,987.15/4,121.28 = 1,807.79/x
  3. Step 3: Cross multiply
    2,987.15x = 4,121.28 × 1,807.79
  4. Step 4: Simplify right side
    2,987.15x = 7,450,388.16
  5. Step 5: Solve for x
    x = 7,450,388.16/2,987.15
  6. Step 6: Final answer
    x = 2,494.15

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1.5x scale

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.