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Finding the Fourth Proportional to 12,406.40, 17,120.82 and 7,101.20

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Solution

The fourth proportional to 12,406.40, 17,120.82 and 7,101.20 is: 9,799.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,406.40 : 17,120.82 = 7,101.20 : x
  2. Step 2: Convert to fraction form
    12,406.40/17,120.82 = 7,101.20/x
  3. Step 3: Cross multiply
    12,406.40x = 17,120.82 × 7,101.20
  4. Step 4: Simplify right side
    12,406.40x = 121,578,366.98
  5. Step 5: Solve for x
    x = 121,578,366.98/12,406.40
  6. Step 6: Final answer
    x = 9,799.65

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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.