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Finding the Fourth Proportional to 128,632.63, 177,519.36 and 77,644.55

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Solution

The fourth proportional to 128,632.63, 177,519.36 and 77,644.55 is: 107,153.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,632.63 : 177,519.36 = 77,644.55 : x
  2. Step 2: Convert to fraction form
    128,632.63/177,519.36 = 77,644.55/x
  3. Step 3: Cross multiply
    128,632.63x = 177,519.36 × 77,644.55
  4. Step 4: Simplify right side
    128,632.63x = 13,783,410,823.49
  5. Step 5: Solve for x
    x = 13,783,410,823.49/128,632.63
  6. Step 6: Final answer
    x = 107,153.30

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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.