Home / 2,981.78-4,113.40-1,987.16

Finding the Fourth Proportional to 2,981.78, 4,113.40 and 1,987.16

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Solution

The fourth proportional to 2,981.78, 4,113.40 and 1,987.16 is: 2,741.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,981.78 : 4,113.40 = 1,987.16 : x
  2. Step 2: Convert to fraction form
    2,981.78/4,113.40 = 1,987.16/x
  3. Step 3: Cross multiply
    2,981.78x = 4,113.40 × 1,987.16
  4. Step 4: Simplify right side
    2,981.78x = 8,173,983.94
  5. Step 5: Solve for x
    x = 8,173,983.94/2,981.78
  6. Step 6: Final answer
    x = 2,741.31

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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.