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Finding the Fourth Proportional to 128,086.60, 176,758.81 and 74,384.81

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Solution

The fourth proportional to 128,086.60, 176,758.81 and 74,384.81 is: 102,650.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,086.60 : 176,758.81 = 74,384.81 : x
  2. Step 2: Convert to fraction form
    128,086.60/176,758.81 = 74,384.81/x
  3. Step 3: Cross multiply
    128,086.60x = 176,758.81 × 74,384.81
  4. Step 4: Simplify right side
    128,086.60x = 13,148,170,497.68
  5. Step 5: Solve for x
    x = 13,148,170,497.68/128,086.60
  6. Step 6: Final answer
    x = 102,650.63

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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.