Home / 128,722.37-177,439.95-90,374.31

Finding the Fourth Proportional to 128,722.37, 177,439.95 and 90,374.31

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Solution

The fourth proportional to 128,722.37, 177,439.95 and 90,374.31 is: 124,578.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,722.37 : 177,439.95 = 90,374.31 : x
  2. Step 2: Convert to fraction form
    128,722.37/177,439.95 = 90,374.31/x
  3. Step 3: Cross multiply
    128,722.37x = 177,439.95 × 90,374.31
  4. Step 4: Simplify right side
    128,722.37x = 16,036,013,047.68
  5. Step 5: Solve for x
    x = 16,036,013,047.68/128,722.37
  6. Step 6: Final answer
    x = 124,578.30

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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.