Home / 128,776.06-177,710.25-72,186.22

Finding the Fourth Proportional to 128,776.06, 177,710.25 and 72,186.22

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Solution

The fourth proportional to 128,776.06, 177,710.25 and 72,186.22 is: 99,616.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,776.06 : 177,710.25 = 72,186.22 : x
  2. Step 2: Convert to fraction form
    128,776.06/177,710.25 = 72,186.22/x
  3. Step 3: Cross multiply
    128,776.06x = 177,710.25 × 72,186.22
  4. Step 4: Simplify right side
    128,776.06x = 12,828,231,202.76
  5. Step 5: Solve for x
    x = 12,828,231,202.76/128,776.06
  6. Step 6: Final answer
    x = 99,616.58

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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.