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Finding the Fourth Proportional to 12,405.95, 17,120.97 and 7,100.64

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Solution

The fourth proportional to 12,405.95, 17,120.97 and 7,100.64 is: 9,799.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,405.95 : 17,120.97 = 7,100.64 : x
  2. Step 2: Convert to fraction form
    12,405.95/17,120.97 = 7,100.64/x
  3. Step 3: Cross multiply
    12,405.95x = 17,120.97 × 7,100.64
  4. Step 4: Simplify right side
    12,405.95x = 121,569,844.42
  5. Step 5: Solve for x
    x = 121,569,844.42/12,405.95
  6. Step 6: Final answer
    x = 9,799.32

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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.