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Finding the Fourth Proportional to 6,889.80, 9,507.60 and 3,905.40

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Solution

The fourth proportional to 6,889.80, 9,507.60 and 3,905.40 is: 5,389.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,889.80 : 9,507.60 = 3,905.40 : x
  2. Step 2: Convert to fraction form
    6,889.80/9,507.60 = 3,905.40/x
  3. Step 3: Cross multiply
    6,889.80x = 9,507.60 × 3,905.40
  4. Step 4: Simplify right side
    6,889.80x = 37,130,981.04
  5. Step 5: Solve for x
    x = 37,130,981.04/6,889.80
  6. Step 6: Final answer
    x = 5,389.27

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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.