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Finding the Fourth Proportional to 2,868.80, 4,291.20 and 2,578.40

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Solution

The fourth proportional to 2,868.80, 4,291.20 and 2,578.40 is: 3,856.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,868.80 : 4,291.20 = 2,578.40 : x
  2. Step 2: Convert to fraction form
    2,868.80/4,291.20 = 2,578.40/x
  3. Step 3: Cross multiply
    2,868.80x = 4,291.20 × 2,578.40
  4. Step 4: Simplify right side
    2,868.80x = 11,064,430.08
  5. Step 5: Solve for x
    x = 11,064,430.08/2,868.80
  6. Step 6: Final answer
    x = 3,856.81

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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.