Home / 12,780.20-17,636.64-7,191.20

Finding the Fourth Proportional to 12,780.20, 17,636.64 and 7,191.20

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Solution

The fourth proportional to 12,780.20, 17,636.64 and 7,191.20 is: 9,923.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,780.20 : 17,636.64 = 7,191.20 : x
  2. Step 2: Convert to fraction form
    12,780.20/17,636.64 = 7,191.20/x
  3. Step 3: Cross multiply
    12,780.20x = 17,636.64 × 7,191.20
  4. Step 4: Simplify right side
    12,780.20x = 126,828,605.57
  5. Step 5: Solve for x
    x = 126,828,605.57/12,780.20
  6. Step 6: Final answer
    x = 9,923.84

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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.