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Finding the Fourth Proportional to 1,321.88, 1,983.28 and 619.71

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Solution

The fourth proportional to 1,321.88, 1,983.28 and 619.71 is: 929.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.88 : 1,983.28 = 619.71 : x
  2. Step 2: Convert to fraction form
    1,321.88/1,983.28 = 619.71/x
  3. Step 3: Cross multiply
    1,321.88x = 1,983.28 × 619.71
  4. Step 4: Simplify right side
    1,321.88x = 1,229,058.45
  5. Step 5: Solve for x
    x = 1,229,058.45/1,321.88
  6. Step 6: Final answer
    x = 929.78

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1.5x scale

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.