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Finding the Fourth Proportional to 19,886.40, 27,437.40 and 12,338.64

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Solution

The fourth proportional to 19,886.40, 27,437.40 and 12,338.64 is: 17,023.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,886.40 : 27,437.40 = 12,338.64 : x
  2. Step 2: Convert to fraction form
    19,886.40/27,437.40 = 12,338.64/x
  3. Step 3: Cross multiply
    19,886.40x = 27,437.40 × 12,338.64
  4. Step 4: Simplify right side
    19,886.40x = 338,540,201.14
  5. Step 5: Solve for x
    x = 338,540,201.14/19,886.40
  6. Step 6: Final answer
    x = 17,023.70

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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.