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Finding the Fourth Proportional to 2,651.48, 3,977.66 and 919.70

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Solution

The fourth proportional to 2,651.48, 3,977.66 and 919.70 is: 1,379.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,651.48 : 3,977.66 = 919.70 : x
  2. Step 2: Convert to fraction form
    2,651.48/3,977.66 = 919.70/x
  3. Step 3: Cross multiply
    2,651.48x = 3,977.66 × 919.70
  4. Step 4: Simplify right side
    2,651.48x = 3,658,253.90
  5. Step 5: Solve for x
    x = 3,658,253.90/2,651.48
  6. Step 6: Final answer
    x = 1,379.70

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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.