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Finding the Fourth Proportional to 752.08, 1,037.92 and 420.56

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Solution

The fourth proportional to 752.08, 1,037.92 and 420.56 is: 580.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.08 : 1,037.92 = 420.56 : x
  2. Step 2: Convert to fraction form
    752.08/1,037.92 = 420.56/x
  3. Step 3: Cross multiply
    752.08x = 1,037.92 × 420.56
  4. Step 4: Simplify right side
    752.08x = 436,509.18
  5. Step 5: Solve for x
    x = 436,509.18/752.08
  6. Step 6: Final answer
    x = 580.40

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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.