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Finding the Fourth Proportional to 128,118.64, 176,752.88 and 85,609.84

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Solution

The fourth proportional to 128,118.64, 176,752.88 and 85,609.84 is: 118,107.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,118.64 : 176,752.88 = 85,609.84 : x
  2. Step 2: Convert to fraction form
    128,118.64/176,752.88 = 85,609.84/x
  3. Step 3: Cross multiply
    128,118.64x = 176,752.88 × 85,609.84
  4. Step 4: Simplify right side
    128,118.64x = 15,131,785,776.34
  5. Step 5: Solve for x
    x = 15,131,785,776.34/128,118.64
  6. Step 6: Final answer
    x = 118,107.61

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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.