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Finding the Fourth Proportional to 441.76, 661.88 and 287.60

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Solution

The fourth proportional to 441.76, 661.88 and 287.60 is: 430.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    441.76 : 661.88 = 287.60 : x
  2. Step 2: Convert to fraction form
    441.76/661.88 = 287.60/x
  3. Step 3: Cross multiply
    441.76x = 661.88 × 287.60
  4. Step 4: Simplify right side
    441.76x = 190,356.69
  5. Step 5: Solve for x
    x = 190,356.69/441.76
  6. Step 6: Final answer
    x = 430.91

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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.