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Finding the Fourth Proportional to 407.19, 611.09 and 303.31

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Solution

The fourth proportional to 407.19, 611.09 and 303.31 is: 455.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.19 : 611.09 = 303.31 : x
  2. Step 2: Convert to fraction form
    407.19/611.09 = 303.31/x
  3. Step 3: Cross multiply
    407.19x = 611.09 × 303.31
  4. Step 4: Simplify right side
    407.19x = 185,349.71
  5. Step 5: Solve for x
    x = 185,349.71/407.19
  6. Step 6: Final answer
    x = 455.19

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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.