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Finding the Fourth Proportional to 11,485.80, 15,849.20 and 7,708.20

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Solution

The fourth proportional to 11,485.80, 15,849.20 and 7,708.20 is: 10,636.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,485.80 : 15,849.20 = 7,708.20 : x
  2. Step 2: Convert to fraction form
    11,485.80/15,849.20 = 7,708.20/x
  3. Step 3: Cross multiply
    11,485.80x = 15,849.20 × 7,708.20
  4. Step 4: Simplify right side
    11,485.80x = 122,168,803.44
  5. Step 5: Solve for x
    x = 122,168,803.44/11,485.80
  6. Step 6: Final answer
    x = 10,636.51

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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.