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Finding the Fourth Proportional to 128,000.09, 176,644.37 and 69,860

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Solution

The fourth proportional to 128,000.09, 176,644.37 and 69,860 is: 96,409.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,000.09 : 176,644.37 = 69,860 : x
  2. Step 2: Convert to fraction form
    128,000.09/176,644.37 = 69,860/x
  3. Step 3: Cross multiply
    128,000.09x = 176,644.37 × 69,860
  4. Step 4: Simplify right side
    128,000.09x = 12,340,375,338.90
  5. Step 5: Solve for x
    x = 12,340,375,338.90/128,000.09
  6. Step 6: Final answer
    x = 96,409.11

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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.