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Finding the Fourth Proportional to 752.41, 1,038.86 and 619.80

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Solution

The fourth proportional to 752.41, 1,038.86 and 619.80 is: 855.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.41 : 1,038.86 = 619.80 : x
  2. Step 2: Convert to fraction form
    752.41/1,038.86 = 619.80/x
  3. Step 3: Cross multiply
    752.41x = 1,038.86 × 619.80
  4. Step 4: Simplify right side
    752.41x = 643,885.43
  5. Step 5: Solve for x
    x = 643,885.43/752.41
  6. Step 6: Final answer
    x = 855.76

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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.