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Finding the Fourth Proportional to 672.64, 1,007.80 and 441.40

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Solution

The fourth proportional to 672.64, 1,007.80 and 441.40 is: 661.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.64 : 1,007.80 = 441.40 : x
  2. Step 2: Convert to fraction form
    672.64/1,007.80 = 441.40/x
  3. Step 3: Cross multiply
    672.64x = 1,007.80 × 441.40
  4. Step 4: Simplify right side
    672.64x = 444,842.92
  5. Step 5: Solve for x
    x = 444,842.92/672.64
  6. Step 6: Final answer
    x = 661.34

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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.