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Finding the Fourth Proportional to 13,011.80, 19,485.30 and 10,419.80

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Solution

The fourth proportional to 13,011.80, 19,485.30 and 10,419.80 is: 15,603.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,011.80 : 19,485.30 = 10,419.80 : x
  2. Step 2: Convert to fraction form
    13,011.80/19,485.30 = 10,419.80/x
  3. Step 3: Cross multiply
    13,011.80x = 19,485.30 × 10,419.80
  4. Step 4: Simplify right side
    13,011.80x = 203,032,928.94
  5. Step 5: Solve for x
    x = 203,032,928.94/13,011.80
  6. Step 6: Final answer
    x = 15,603.75

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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.