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Finding the Fourth Proportional to 128,983.61, 178,002.49 and 74,533.97

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Solution

The fourth proportional to 128,983.61, 178,002.49 and 74,533.97 is: 102,859.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,983.61 : 178,002.49 = 74,533.97 : x
  2. Step 2: Convert to fraction form
    128,983.61/178,002.49 = 74,533.97/x
  3. Step 3: Cross multiply
    128,983.61x = 178,002.49 × 74,533.97
  4. Step 4: Simplify right side
    128,983.61x = 13,267,231,173.24
  5. Step 5: Solve for x
    x = 13,267,231,173.24/128,983.61
  6. Step 6: Final answer
    x = 102,859.83

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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.