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Finding the Fourth Proportional to 13,108.88, 18,090.30 and 7,140.49

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Solution

The fourth proportional to 13,108.88, 18,090.30 and 7,140.49 is: 9,853.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,108.88 : 18,090.30 = 7,140.49 : x
  2. Step 2: Convert to fraction form
    13,108.88/18,090.30 = 7,140.49/x
  3. Step 3: Cross multiply
    13,108.88x = 18,090.30 × 7,140.49
  4. Step 4: Simplify right side
    13,108.88x = 129,173,606.25
  5. Step 5: Solve for x
    x = 129,173,606.25/13,108.88
  6. Step 6: Final answer
    x = 9,853.90

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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.