Home / 8,128.19-11,214.64-5,145.30

Finding the Fourth Proportional to 8,128.19, 11,214.64 and 5,145.30

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Solution

The fourth proportional to 8,128.19, 11,214.64 and 5,145.30 is: 7,099.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,128.19 : 11,214.64 = 5,145.30 : x
  2. Step 2: Convert to fraction form
    8,128.19/11,214.64 = 5,145.30/x
  3. Step 3: Cross multiply
    8,128.19x = 11,214.64 × 5,145.30
  4. Step 4: Simplify right side
    8,128.19x = 57,702,687.19
  5. Step 5: Solve for x
    x = 57,702,687.19/8,128.19
  6. Step 6: Final answer
    x = 7,099.08

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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.