Home / 85,983.46-128,103.53-81,748.64

Finding the Fourth Proportional to 85,983.46, 128,103.53 and 81,748.64

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Solution

The fourth proportional to 85,983.46, 128,103.53 and 81,748.64 is: 121,794.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,983.46 : 128,103.53 = 81,748.64 : x
  2. Step 2: Convert to fraction form
    85,983.46/128,103.53 = 81,748.64/x
  3. Step 3: Cross multiply
    85,983.46x = 128,103.53 × 81,748.64
  4. Step 4: Simplify right side
    85,983.46x = 10,472,289,268.21
  5. Step 5: Solve for x
    x = 10,472,289,268.21/85,983.46
  6. Step 6: Final answer
    x = 121,794.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.