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Finding the Fourth Proportional to 919.00, 1,378.86 and 302.79

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Solution

The fourth proportional to 919.00, 1,378.86 and 302.79 is: 454.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.00 : 1,378.86 = 302.79 : x
  2. Step 2: Convert to fraction form
    919.00/1,378.86 = 302.79/x
  3. Step 3: Cross multiply
    919.00x = 1,378.86 × 302.79
  4. Step 4: Simplify right side
    919.00x = 417,509.05
  5. Step 5: Solve for x
    x = 417,509.05/919.00
  6. Step 6: Final answer
    x = 454.31

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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.