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Finding the Fourth Proportional to 13,143.89, 18,137.88 and 7,174.40

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Solution

The fourth proportional to 13,143.89, 18,137.88 and 7,174.40 is: 9,900.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,143.89 : 18,137.88 = 7,174.40 : x
  2. Step 2: Convert to fraction form
    13,143.89/18,137.88 = 7,174.40/x
  3. Step 3: Cross multiply
    13,143.89x = 18,137.88 × 7,174.40
  4. Step 4: Simplify right side
    13,143.89x = 130,128,486.42
  5. Step 5: Solve for x
    x = 130,128,486.42/13,143.89
  6. Step 6: Final answer
    x = 9,900.30

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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.