Home / 2,851.40-4,272.30-1,387.40

Finding the Fourth Proportional to 2,851.40, 4,272.30 and 1,387.40

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Solution

The fourth proportional to 2,851.40, 4,272.30 and 1,387.40 is: 2,078.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,851.40 : 4,272.30 = 1,387.40 : x
  2. Step 2: Convert to fraction form
    2,851.40/4,272.30 = 1,387.40/x
  3. Step 3: Cross multiply
    2,851.40x = 4,272.30 × 1,387.40
  4. Step 4: Simplify right side
    2,851.40x = 5,927,389.02
  5. Step 5: Solve for x
    x = 5,927,389.02/2,851.40
  6. Step 6: Final answer
    x = 2,078.76

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1.5x scale

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.