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Finding the Fourth Proportional to 615.56, 919.29 and 609.21

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Solution

The fourth proportional to 615.56, 919.29 and 609.21 is: 909.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.56 : 919.29 = 609.21 : x
  2. Step 2: Convert to fraction form
    615.56/919.29 = 609.21/x
  3. Step 3: Cross multiply
    615.56x = 919.29 × 609.21
  4. Step 4: Simplify right side
    615.56x = 560,040.66
  5. Step 5: Solve for x
    x = 560,040.66/615.56
  6. Step 6: Final answer
    x = 909.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.