Home / 128,631.92-177,573.75-90,424.22

Finding the Fourth Proportional to 128,631.92, 177,573.75 and 90,424.22

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Solution

The fourth proportional to 128,631.92, 177,573.75 and 90,424.22 is: 124,828.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,631.92 : 177,573.75 = 90,424.22 : x
  2. Step 2: Convert to fraction form
    128,631.92/177,573.75 = 90,424.22/x
  3. Step 3: Cross multiply
    128,631.92x = 177,573.75 × 90,424.22
  4. Step 4: Simplify right side
    128,631.92x = 16,056,967,836.23
  5. Step 5: Solve for x
    x = 16,056,967,836.23/128,631.92
  6. Step 6: Final answer
    x = 124,828.80

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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.