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Finding the Fourth Proportional to 128,215.96, 176,938.50 and 71,628.28

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Solution

The fourth proportional to 128,215.96, 176,938.50 and 71,628.28 is: 98,847.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,215.96 : 176,938.50 = 71,628.28 : x
  2. Step 2: Convert to fraction form
    128,215.96/176,938.50 = 71,628.28/x
  3. Step 3: Cross multiply
    128,215.96x = 176,938.50 × 71,628.28
  4. Step 4: Simplify right side
    128,215.96x = 12,673,800,420.78
  5. Step 5: Solve for x
    x = 12,673,800,420.78/128,215.96
  6. Step 6: Final answer
    x = 98,847.29

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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.