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Finding the Fourth Proportional to 128,150.40, 176,840.64 and 80,388.48

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Solution

The fourth proportional to 128,150.40, 176,840.64 and 80,388.48 is: 110,931.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,150.40 : 176,840.64 = 80,388.48 : x
  2. Step 2: Convert to fraction form
    128,150.40/176,840.64 = 80,388.48/x
  3. Step 3: Cross multiply
    128,150.40x = 176,840.64 × 80,388.48
  4. Step 4: Simplify right side
    128,150.40x = 14,215,950,251.83
  5. Step 5: Solve for x
    x = 14,215,950,251.83/128,150.40
  6. Step 6: Final answer
    x = 110,931.77

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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.