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Finding the Fourth Proportional to 7,509, 11,255.94 and 3,128.88

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Solution

The fourth proportional to 7,509, 11,255.94 and 3,128.88 is: 4,690.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,509 : 11,255.94 = 3,128.88 : x
  2. Step 2: Convert to fraction form
    7,509/11,255.94 = 3,128.88/x
  3. Step 3: Cross multiply
    7,509x = 11,255.94 × 3,128.88
  4. Step 4: Simplify right side
    7,509x = 35,218,485.55
  5. Step 5: Solve for x
    x = 35,218,485.55/7,509
  6. Step 6: Final answer
    x = 4,690.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.