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Finding the Fourth Proportional to 7,133.40, 9,843.90 and 3,989.40

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Solution

The fourth proportional to 7,133.40, 9,843.90 and 3,989.40 is: 5,505.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,133.40 : 9,843.90 = 3,989.40 : x
  2. Step 2: Convert to fraction form
    7,133.40/9,843.90 = 3,989.40/x
  3. Step 3: Cross multiply
    7,133.40x = 9,843.90 × 3,989.40
  4. Step 4: Simplify right side
    7,133.40x = 39,271,254.66
  5. Step 5: Solve for x
    x = 39,271,254.66/7,133.40
  6. Step 6: Final answer
    x = 5,505.26

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1.5x scale

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.