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Finding the Fourth Proportional to 128,644.67, 177,616.28 and 80,320.17

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Solution

The fourth proportional to 128,644.67, 177,616.28 and 80,320.17 is: 110,895.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,644.67 : 177,616.28 = 80,320.17 : x
  2. Step 2: Convert to fraction form
    128,644.67/177,616.28 = 80,320.17/x
  3. Step 3: Cross multiply
    128,644.67x = 177,616.28 × 80,320.17
  4. Step 4: Simplify right side
    128,644.67x = 14,266,170,671.23
  5. Step 5: Solve for x
    x = 14,266,170,671.23/128,644.67
  6. Step 6: Final answer
    x = 110,895.93

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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.