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Finding the Fourth Proportional to 12,139.20, 17,006.40 and 12,139.20

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Solution

The fourth proportional to 12,139.20, 17,006.40 and 12,139.20 is: 17,006.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.20 : 17,006.40 = 12,139.20 : x
  2. Step 2: Convert to fraction form
    12,139.20/17,006.40 = 12,139.20/x
  3. Step 3: Cross multiply
    12,139.20x = 17,006.40 × 12,139.20
  4. Step 4: Simplify right side
    12,139.20x = 206,444,090.88
  5. Step 5: Solve for x
    x = 206,444,090.88/12,139.20
  6. Step 6: Final answer
    x = 17,006.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.