Home / 13,780.20-19,016.86-7,811.72

Finding the Fourth Proportional to 13,780.20, 19,016.86 and 7,811.72

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Solution

The fourth proportional to 13,780.20, 19,016.86 and 7,811.72 is: 10,780.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,780.20 : 19,016.86 = 7,811.72 : x
  2. Step 2: Convert to fraction form
    13,780.20/19,016.86 = 7,811.72/x
  3. Step 3: Cross multiply
    13,780.20x = 19,016.86 × 7,811.72
  4. Step 4: Simplify right side
    13,780.20x = 148,554,385.60
  5. Step 5: Solve for x
    x = 148,554,385.60/13,780.20
  6. Step 6: Final answer
    x = 10,780.28

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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.