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Finding the Fourth Proportional to 752.69, 1,128.51 and 290.09

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Solution

The fourth proportional to 752.69, 1,128.51 and 290.09 is: 434.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.69 : 1,128.51 = 290.09 : x
  2. Step 2: Convert to fraction form
    752.69/1,128.51 = 290.09/x
  3. Step 3: Cross multiply
    752.69x = 1,128.51 × 290.09
  4. Step 4: Simplify right side
    752.69x = 327,372.29
  5. Step 5: Solve for x
    x = 327,372.29/752.69
  6. Step 6: Final answer
    x = 434.93

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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.