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Finding the Fourth Proportional to 479.19, 661.49 and 302.31

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Solution

The fourth proportional to 479.19, 661.49 and 302.31 is: 417.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.19 : 661.49 = 302.31 : x
  2. Step 2: Convert to fraction form
    479.19/661.49 = 302.31/x
  3. Step 3: Cross multiply
    479.19x = 661.49 × 302.31
  4. Step 4: Simplify right side
    479.19x = 199,975.04
  5. Step 5: Solve for x
    x = 199,975.04/479.19
  6. Step 6: Final answer
    x = 417.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.