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Finding the Fourth Proportional to 1,113.57, 1,669.21 and 382.75

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Solution

The fourth proportional to 1,113.57, 1,669.21 and 382.75 is: 573.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.57 : 1,669.21 = 382.75 : x
  2. Step 2: Convert to fraction form
    1,113.57/1,669.21 = 382.75/x
  3. Step 3: Cross multiply
    1,113.57x = 1,669.21 × 382.75
  4. Step 4: Simplify right side
    1,113.57x = 638,885.00
  5. Step 5: Solve for x
    x = 638,885.00/1,113.57
  6. Step 6: Final answer
    x = 573.73

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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.