Home / 128,710.06-177,619.56-72,121.43

Finding the Fourth Proportional to 128,710.06, 177,619.56 and 72,121.43

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Solution

The fourth proportional to 128,710.06, 177,619.56 and 72,121.43 is: 99,527.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,710.06 : 177,619.56 = 72,121.43 : x
  2. Step 2: Convert to fraction form
    128,710.06/177,619.56 = 72,121.43/x
  3. Step 3: Cross multiply
    128,710.06x = 177,619.56 × 72,121.43
  4. Step 4: Simplify right side
    128,710.06x = 12,810,176,663.17
  5. Step 5: Solve for x
    x = 12,810,176,663.17/128,710.06
  6. Step 6: Final answer
    x = 99,527.39

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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.