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Finding the Fourth Proportional to 128,050.72, 176,712.81 and 70,689.90

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Solution

The fourth proportional to 128,050.72, 176,712.81 and 70,689.90 is: 97,553.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,050.72 : 176,712.81 = 70,689.90 : x
  2. Step 2: Convert to fraction form
    128,050.72/176,712.81 = 70,689.90/x
  3. Step 3: Cross multiply
    128,050.72x = 176,712.81 × 70,689.90
  4. Step 4: Simplify right side
    128,050.72x = 12,491,810,867.62
  5. Step 5: Solve for x
    x = 12,491,810,867.62/128,050.72
  6. Step 6: Final answer
    x = 97,553.62

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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.