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Finding the Fourth Proportional to 752.64, 1,128.40 and 290.24

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Solution

The fourth proportional to 752.64, 1,128.40 and 290.24 is: 435.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.64 : 1,128.40 = 290.24 : x
  2. Step 2: Convert to fraction form
    752.64/1,128.40 = 290.24/x
  3. Step 3: Cross multiply
    752.64x = 1,128.40 × 290.24
  4. Step 4: Simplify right side
    752.64x = 327,506.82
  5. Step 5: Solve for x
    x = 327,506.82/752.64
  6. Step 6: Final answer
    x = 435.14

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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.