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Finding the Fourth Proportional to 752.45, 1,038.33 and 420.81

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Solution

The fourth proportional to 752.45, 1,038.33 and 420.81 is: 580.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.45 : 1,038.33 = 420.81 : x
  2. Step 2: Convert to fraction form
    752.45/1,038.33 = 420.81/x
  3. Step 3: Cross multiply
    752.45x = 1,038.33 × 420.81
  4. Step 4: Simplify right side
    752.45x = 436,935.75
  5. Step 5: Solve for x
    x = 436,935.75/752.45
  6. Step 6: Final answer
    x = 580.69

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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.