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Finding the Fourth Proportional to 12,459.80, 18,689.70 and 11,512.10

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Solution

The fourth proportional to 12,459.80, 18,689.70 and 11,512.10 is: 17,268.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,459.80 : 18,689.70 = 11,512.10 : x
  2. Step 2: Convert to fraction form
    12,459.80/18,689.70 = 11,512.10/x
  3. Step 3: Cross multiply
    12,459.80x = 18,689.70 × 11,512.10
  4. Step 4: Simplify right side
    12,459.80x = 215,157,695.37
  5. Step 5: Solve for x
    x = 215,157,695.37/12,459.80
  6. Step 6: Final answer
    x = 17,268.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.