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Finding the Fourth Proportional to 13,157.84, 18,157.06 and 7,189.56

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Solution

The fourth proportional to 13,157.84, 18,157.06 and 7,189.56 is: 9,921.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,157.84 : 18,157.06 = 7,189.56 : x
  2. Step 2: Convert to fraction form
    13,157.84/18,157.06 = 7,189.56/x
  3. Step 3: Cross multiply
    13,157.84x = 18,157.06 × 7,189.56
  4. Step 4: Simplify right side
    13,157.84x = 130,541,281.28
  5. Step 5: Solve for x
    x = 130,541,281.28/13,157.84
  6. Step 6: Final answer
    x = 9,921.18

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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.