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Finding the Fourth Proportional to 441.68, 661.98 and 387.68

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Solution

The fourth proportional to 441.68, 661.98 and 387.68 is: 581.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    441.68 : 661.98 = 387.68 : x
  2. Step 2: Convert to fraction form
    441.68/661.98 = 387.68/x
  3. Step 3: Cross multiply
    441.68x = 661.98 × 387.68
  4. Step 4: Simplify right side
    441.68x = 256,636.41
  5. Step 5: Solve for x
    x = 256,636.41/441.68
  6. Step 6: Final answer
    x = 581.05

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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.