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Finding the Fourth Proportional to 128,021.73, 176,669.85 and 71,433.11

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Solution

The fourth proportional to 128,021.73, 176,669.85 and 71,433.11 is: 98,577.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,021.73 : 176,669.85 = 71,433.11 : x
  2. Step 2: Convert to fraction form
    128,021.73/176,669.85 = 71,433.11/x
  3. Step 3: Cross multiply
    128,021.73x = 176,669.85 × 71,433.11
  4. Step 4: Simplify right side
    128,021.73x = 12,620,075,945.38
  5. Step 5: Solve for x
    x = 12,620,075,945.38/128,021.73
  6. Step 6: Final answer
    x = 98,577.61

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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.