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Finding the Fourth Proportional to 752.79, 1,128.35 and 405.26

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Solution

The fourth proportional to 752.79, 1,128.35 and 405.26 is: 607.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.79 : 1,128.35 = 405.26 : x
  2. Step 2: Convert to fraction form
    752.79/1,128.35 = 405.26/x
  3. Step 3: Cross multiply
    752.79x = 1,128.35 × 405.26
  4. Step 4: Simplify right side
    752.79x = 457,275.12
  5. Step 5: Solve for x
    x = 457,275.12/752.79
  6. Step 6: Final answer
    x = 607.44

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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.