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Finding the Fourth Proportional to 3,515.94, 5,274.21 and 918.88

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Solution

The fourth proportional to 3,515.94, 5,274.21 and 918.88 is: 1,378.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,515.94 : 5,274.21 = 918.88 : x
  2. Step 2: Convert to fraction form
    3,515.94/5,274.21 = 918.88/x
  3. Step 3: Cross multiply
    3,515.94x = 5,274.21 × 918.88
  4. Step 4: Simplify right side
    3,515.94x = 4,846,366.08
  5. Step 5: Solve for x
    x = 4,846,366.08/3,515.94
  6. Step 6: Final answer
    x = 1,378.40

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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.