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Finding the Fourth Proportional to 13,780.86, 19,016.52 and 7,811.16

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Solution

The fourth proportional to 13,780.86, 19,016.52 and 7,811.16 is: 10,778.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,780.86 : 19,016.52 = 7,811.16 : x
  2. Step 2: Convert to fraction form
    13,780.86/19,016.52 = 7,811.16/x
  3. Step 3: Cross multiply
    13,780.86x = 19,016.52 × 7,811.16
  4. Step 4: Simplify right side
    13,780.86x = 148,541,080.36
  5. Step 5: Solve for x
    x = 148,541,080.36/13,780.86
  6. Step 6: Final answer
    x = 10,778.80

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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.