Home / 128,028.12-176,679-71,438.28

Finding the Fourth Proportional to 128,028.12, 176,679 and 71,438.28

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Solution

The fourth proportional to 128,028.12, 176,679 and 71,438.28 is: 98,584.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,028.12 : 176,679 = 71,438.28 : x
  2. Step 2: Convert to fraction form
    128,028.12/176,679 = 71,438.28/x
  3. Step 3: Cross multiply
    128,028.12x = 176,679 × 71,438.28
  4. Step 4: Simplify right side
    128,028.12x = 12,621,643,872.12
  5. Step 5: Solve for x
    x = 12,621,643,872.12/128,028.12
  6. Step 6: Final answer
    x = 98,584.93

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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.