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Finding the Fourth Proportional to 13,687.40, 19,181.80 and 13,687.40

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Solution

The fourth proportional to 13,687.40, 19,181.80 and 13,687.40 is: 19,181.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,687.40 : 19,181.80 = 13,687.40 : x
  2. Step 2: Convert to fraction form
    13,687.40/19,181.80 = 13,687.40/x
  3. Step 3: Cross multiply
    13,687.40x = 19,181.80 × 13,687.40
  4. Step 4: Simplify right side
    13,687.40x = 262,548,969.32
  5. Step 5: Solve for x
    x = 262,548,969.32/13,687.40
  6. Step 6: Final answer
    x = 19,181.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.