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Finding the Fourth Proportional to 752.36, 1,128.08 and 289.62

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Solution

The fourth proportional to 752.36, 1,128.08 and 289.62 is: 434.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.36 : 1,128.08 = 289.62 : x
  2. Step 2: Convert to fraction form
    752.36/1,128.08 = 289.62/x
  3. Step 3: Cross multiply
    752.36x = 1,128.08 × 289.62
  4. Step 4: Simplify right side
    752.36x = 326,714.53
  5. Step 5: Solve for x
    x = 326,714.53/752.36
  6. Step 6: Final answer
    x = 434.25

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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.