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Finding the Fourth Proportional to 919.02, 1,378.62 and 302.70

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Solution

The fourth proportional to 919.02, 1,378.62 and 302.70 is: 454.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.02 : 1,378.62 = 302.70 : x
  2. Step 2: Convert to fraction form
    919.02/1,378.62 = 302.70/x
  3. Step 3: Cross multiply
    919.02x = 1,378.62 × 302.70
  4. Step 4: Simplify right side
    919.02x = 417,308.27
  5. Step 5: Solve for x
    x = 417,308.27/919.02
  6. Step 6: Final answer
    x = 454.08

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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.