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Finding the Fourth Proportional to 128,166.12, 176,868.78 and 74,482.68

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Solution

The fourth proportional to 128,166.12, 176,868.78 and 74,482.68 is: 102,785.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,166.12 : 176,868.78 = 74,482.68 : x
  2. Step 2: Convert to fraction form
    128,166.12/176,868.78 = 74,482.68/x
  3. Step 3: Cross multiply
    128,166.12x = 176,868.78 × 74,482.68
  4. Step 4: Simplify right side
    128,166.12x = 13,173,660,742.73
  5. Step 5: Solve for x
    x = 13,173,660,742.73/128,166.12
  6. Step 6: Final answer
    x = 102,785.83

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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.