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Finding the Fourth Proportional to 128,503.58, 177,443.80 and 80,772.30

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Solution

The fourth proportional to 128,503.58, 177,443.80 and 80,772.30 is: 111,534.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,503.58 : 177,443.80 = 80,772.30 : x
  2. Step 2: Convert to fraction form
    128,503.58/177,443.80 = 80,772.30/x
  3. Step 3: Cross multiply
    128,503.58x = 177,443.80 × 80,772.30
  4. Step 4: Simplify right side
    128,503.58x = 14,332,543,644.81
  5. Step 5: Solve for x
    x = 14,332,543,644.81/128,503.58
  6. Step 6: Final answer
    x = 111,534.20

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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.