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Finding the Fourth Proportional to 11,160.99, 15,405.95 and 7,810.80

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Solution

The fourth proportional to 11,160.99, 15,405.95 and 7,810.80 is: 10,781.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,160.99 : 15,405.95 = 7,810.80 : x
  2. Step 2: Convert to fraction form
    11,160.99/15,405.95 = 7,810.80/x
  3. Step 3: Cross multiply
    11,160.99x = 15,405.95 × 7,810.80
  4. Step 4: Simplify right side
    11,160.99x = 120,332,794.26
  5. Step 5: Solve for x
    x = 120,332,794.26/11,160.99
  6. Step 6: Final answer
    x = 10,781.55

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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.