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Finding the Fourth Proportional to 3,625.40, 5,438.10 and 992.90

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Solution

The fourth proportional to 3,625.40, 5,438.10 and 992.90 is: 1,489.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,625.40 : 5,438.10 = 992.90 : x
  2. Step 2: Convert to fraction form
    3,625.40/5,438.10 = 992.90/x
  3. Step 3: Cross multiply
    3,625.40x = 5,438.10 × 992.90
  4. Step 4: Simplify right side
    3,625.40x = 5,399,489.49
  5. Step 5: Solve for x
    x = 5,399,489.49/3,625.40
  6. Step 6: Final answer
    x = 1,489.35

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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.