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Finding the Fourth Proportional to 613.45, 919.11 and 430.49

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Solution

The fourth proportional to 613.45, 919.11 and 430.49 is: 644.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.45 : 919.11 = 430.49 : x
  2. Step 2: Convert to fraction form
    613.45/919.11 = 430.49/x
  3. Step 3: Cross multiply
    613.45x = 919.11 × 430.49
  4. Step 4: Simplify right side
    613.45x = 395,667.66
  5. Step 5: Solve for x
    x = 395,667.66/613.45
  6. Step 6: Final answer
    x = 644.99

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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.