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Finding the Fourth Proportional to 919.45, 1,378.53 and 432.25

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Solution

The fourth proportional to 919.45, 1,378.53 and 432.25 is: 648.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.45 : 1,378.53 = 432.25 : x
  2. Step 2: Convert to fraction form
    919.45/1,378.53 = 432.25/x
  3. Step 3: Cross multiply
    919.45x = 1,378.53 × 432.25
  4. Step 4: Simplify right side
    919.45x = 595,869.59
  5. Step 5: Solve for x
    x = 595,869.59/919.45
  6. Step 6: Final answer
    x = 648.07

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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.