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Finding the Fourth Proportional to 730.71, 1,100.43 and 640.51

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Solution

The fourth proportional to 730.71, 1,100.43 and 640.51 is: 964.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.71 : 1,100.43 = 640.51 : x
  2. Step 2: Convert to fraction form
    730.71/1,100.43 = 640.51/x
  3. Step 3: Cross multiply
    730.71x = 1,100.43 × 640.51
  4. Step 4: Simplify right side
    730.71x = 704,833.67
  5. Step 5: Solve for x
    x = 704,833.67/730.71
  6. Step 6: Final answer
    x = 964.59

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.