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Finding the Fourth Proportional to 407.79, 611.15 and 303.21

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Solution

The fourth proportional to 407.79, 611.15 and 303.21 is: 454.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.79 : 611.15 = 303.21 : x
  2. Step 2: Convert to fraction form
    407.79/611.15 = 303.21/x
  3. Step 3: Cross multiply
    407.79x = 611.15 × 303.21
  4. Step 4: Simplify right side
    407.79x = 185,305.28
  5. Step 5: Solve for x
    x = 185,305.28/407.79
  6. Step 6: Final answer
    x = 454.41

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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.