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Finding the Fourth Proportional to 128,118.42, 191,734.76 and 80,070.03

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Solution

The fourth proportional to 128,118.42, 191,734.76 and 80,070.03 is: 119,828.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,118.42 : 191,734.76 = 80,070.03 : x
  2. Step 2: Convert to fraction form
    128,118.42/191,734.76 = 80,070.03/x
  3. Step 3: Cross multiply
    128,118.42x = 191,734.76 × 80,070.03
  4. Step 4: Simplify right side
    128,118.42x = 15,352,208,185.42
  5. Step 5: Solve for x
    x = 15,352,208,185.42/128,118.42
  6. Step 6: Final answer
    x = 119,828.27

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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.