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Finding the Fourth Proportional to 11,808.20, 17,712.30 and 7,891.40

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Solution

The fourth proportional to 11,808.20, 17,712.30 and 7,891.40 is: 11,837.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,808.20 : 17,712.30 = 7,891.40 : x
  2. Step 2: Convert to fraction form
    11,808.20/17,712.30 = 7,891.40/x
  3. Step 3: Cross multiply
    11,808.20x = 17,712.30 × 7,891.40
  4. Step 4: Simplify right side
    11,808.20x = 139,774,844.22
  5. Step 5: Solve for x
    x = 139,774,844.22/11,808.20
  6. Step 6: Final answer
    x = 11,837.10

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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.