Home / 85,284.09-128,057.36-76,011.21

Finding the Fourth Proportional to 85,284.09, 128,057.36 and 76,011.21

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Solution

The fourth proportional to 85,284.09, 128,057.36 and 76,011.21 is: 114,133.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,284.09 : 128,057.36 = 76,011.21 : x
  2. Step 2: Convert to fraction form
    85,284.09/128,057.36 = 76,011.21/x
  3. Step 3: Cross multiply
    85,284.09x = 128,057.36 × 76,011.21
  4. Step 4: Simplify right side
    85,284.09x = 9,733,794,502.95
  5. Step 5: Solve for x
    x = 9,733,794,502.95/85,284.09
  6. Step 6: Final answer
    x = 114,133.77

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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.