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Finding the Fourth Proportional to 128,370.77, 177,138.02 and 71,000.97

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Solution

The fourth proportional to 128,370.77, 177,138.02 and 71,000.97 is: 97,973.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,370.77 : 177,138.02 = 71,000.97 : x
  2. Step 2: Convert to fraction form
    128,370.77/177,138.02 = 71,000.97/x
  3. Step 3: Cross multiply
    128,370.77x = 177,138.02 × 71,000.97
  4. Step 4: Simplify right side
    128,370.77x = 12,576,970,888.87
  5. Step 5: Solve for x
    x = 12,576,970,888.87/128,370.77
  6. Step 6: Final answer
    x = 97,973.79

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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.