Home / 128,136.72-176,713.96-80,395.28

Finding the Fourth Proportional to 128,136.72, 176,713.96 and 80,395.28

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Solution

The fourth proportional to 128,136.72, 176,713.96 and 80,395.28 is: 110,873.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,136.72 : 176,713.96 = 80,395.28 : x
  2. Step 2: Convert to fraction form
    128,136.72/176,713.96 = 80,395.28/x
  3. Step 3: Cross multiply
    128,136.72x = 176,713.96 × 80,395.28
  4. Step 4: Simplify right side
    128,136.72x = 14,206,968,294.11
  5. Step 5: Solve for x
    x = 14,206,968,294.11/128,136.72
  6. Step 6: Final answer
    x = 110,873.51

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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.