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Finding the Fourth Proportional to 730.34, 1,008.72 and 660.38

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Solution

The fourth proportional to 730.34, 1,008.72 and 660.38 is: 912.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.34 : 1,008.72 = 660.38 : x
  2. Step 2: Convert to fraction form
    730.34/1,008.72 = 660.38/x
  3. Step 3: Cross multiply
    730.34x = 1,008.72 × 660.38
  4. Step 4: Simplify right side
    730.34x = 666,138.51
  5. Step 5: Solve for x
    x = 666,138.51/730.34
  6. Step 6: Final answer
    x = 912.09

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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.