Home / 13,291.20-19,936.80-12,686.40

Finding the Fourth Proportional to 13,291.20, 19,936.80 and 12,686.40

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Solution

The fourth proportional to 13,291.20, 19,936.80 and 12,686.40 is: 19,029.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,291.20 : 19,936.80 = 12,686.40 : x
  2. Step 2: Convert to fraction form
    13,291.20/19,936.80 = 12,686.40/x
  3. Step 3: Cross multiply
    13,291.20x = 19,936.80 × 12,686.40
  4. Step 4: Simplify right side
    13,291.20x = 252,926,219.52
  5. Step 5: Solve for x
    x = 252,926,219.52/13,291.20
  6. Step 6: Final answer
    x = 19,029.60

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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.