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Finding the Fourth Proportional to 19,804.80, 27,340.64 and 15,318.40

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Solution

The fourth proportional to 19,804.80, 27,340.64 and 15,318.40 is: 21,147.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,804.80 : 27,340.64 = 15,318.40 : x
  2. Step 2: Convert to fraction form
    19,804.80/27,340.64 = 15,318.40/x
  3. Step 3: Cross multiply
    19,804.80x = 27,340.64 × 15,318.40
  4. Step 4: Simplify right side
    19,804.80x = 418,814,859.78
  5. Step 5: Solve for x
    x = 418,814,859.78/19,804.80
  6. Step 6: Final answer
    x = 21,147.14

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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.