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Finding the Fourth Proportional to 479.39, 661.70 and 302.40

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Solution

The fourth proportional to 479.39, 661.70 and 302.40 is: 417.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.39 : 661.70 = 302.40 : x
  2. Step 2: Convert to fraction form
    479.39/661.70 = 302.40/x
  3. Step 3: Cross multiply
    479.39x = 661.70 × 302.40
  4. Step 4: Simplify right side
    479.39x = 200,098.84
  5. Step 5: Solve for x
    x = 200,098.84/479.39
  6. Step 6: Final answer
    x = 417.41

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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.