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Finding the Fourth Proportional to 12,405.98, 17,120.18 and 6,740.69

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Solution

The fourth proportional to 12,405.98, 17,120.18 and 6,740.69 is: 9,302.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,405.98 : 17,120.18 = 6,740.69 : x
  2. Step 2: Convert to fraction form
    12,405.98/17,120.18 = 6,740.69/x
  3. Step 3: Cross multiply
    12,405.98x = 17,120.18 × 6,740.69
  4. Step 4: Simplify right side
    12,405.98x = 115,401,826.12
  5. Step 5: Solve for x
    x = 115,401,826.12/12,405.98
  6. Step 6: Final answer
    x = 9,302.11

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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.