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Finding the Fourth Proportional to 2,927.75, 4,391.90 and 847.70

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Solution

The fourth proportional to 2,927.75, 4,391.90 and 847.70 is: 1,271.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,927.75 : 4,391.90 = 847.70 : x
  2. Step 2: Convert to fraction form
    2,927.75/4,391.90 = 847.70/x
  3. Step 3: Cross multiply
    2,927.75x = 4,391.90 × 847.70
  4. Step 4: Simplify right side
    2,927.75x = 3,723,026.73
  5. Step 5: Solve for x
    x = 3,723,026.73/2,927.75
  6. Step 6: Final answer
    x = 1,271.64

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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.