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Finding the Fourth Proportional to 919.45, 1,378.70 and 303.09

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Solution

The fourth proportional to 919.45, 1,378.70 and 303.09 is: 454.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.45 : 1,378.70 = 303.09 : x
  2. Step 2: Convert to fraction form
    919.45/1,378.70 = 303.09/x
  3. Step 3: Cross multiply
    919.45x = 1,378.70 × 303.09
  4. Step 4: Simplify right side
    919.45x = 417,870.18
  5. Step 5: Solve for x
    x = 417,870.18/919.45
  6. Step 6: Final answer
    x = 454.48

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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.