Home / 128,989.06-177,995.14-72,389.50

Finding the Fourth Proportional to 128,989.06, 177,995.14 and 72,389.50

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Solution

The fourth proportional to 128,989.06, 177,995.14 and 72,389.50 is: 99,892.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,989.06 : 177,995.14 = 72,389.50 : x
  2. Step 2: Convert to fraction form
    128,989.06/177,995.14 = 72,389.50/x
  3. Step 3: Cross multiply
    128,989.06x = 177,995.14 × 72,389.50
  4. Step 4: Simplify right side
    128,989.06x = 12,884,979,187.03
  5. Step 5: Solve for x
    x = 12,884,979,187.03/128,989.06
  6. Step 6: Final answer
    x = 99,892.03

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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.