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Finding the Fourth Proportional to 3,911.95, 5,868.13 and 990.28

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Solution

The fourth proportional to 3,911.95, 5,868.13 and 990.28 is: 1,485.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.95 : 5,868.13 = 990.28 : x
  2. Step 2: Convert to fraction form
    3,911.95/5,868.13 = 990.28/x
  3. Step 3: Cross multiply
    3,911.95x = 5,868.13 × 990.28
  4. Step 4: Simplify right side
    3,911.95x = 5,811,074.63
  5. Step 5: Solve for x
    x = 5,811,074.63/3,911.95
  6. Step 6: Final answer
    x = 1,485.47

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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.