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Finding the Fourth Proportional to 128,118.67, 191,735.14 and 80,070.28

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Solution

The fourth proportional to 128,118.67, 191,735.14 and 80,070.28 is: 119,828.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,118.67 : 191,735.14 = 80,070.28 : x
  2. Step 2: Convert to fraction form
    128,118.67/191,735.14 = 80,070.28/x
  3. Step 3: Cross multiply
    128,118.67x = 191,735.14 × 80,070.28
  4. Step 4: Simplify right side
    128,118.67x = 15,352,286,145.46
  5. Step 5: Solve for x
    x = 15,352,286,145.46/128,118.67
  6. Step 6: Final answer
    x = 119,828.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.