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Finding the Fourth Proportional to 128,508.75, 177,335.57 and 70,363.91

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Solution

The fourth proportional to 128,508.75, 177,335.57 and 70,363.91 is: 97,098.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,508.75 : 177,335.57 = 70,363.91 : x
  2. Step 2: Convert to fraction form
    128,508.75/177,335.57 = 70,363.91/x
  3. Step 3: Cross multiply
    128,508.75x = 177,335.57 × 70,363.91
  4. Step 4: Simplify right side
    128,508.75x = 12,478,022,848.78
  5. Step 5: Solve for x
    x = 12,478,022,848.78/128,508.75
  6. Step 6: Final answer
    x = 97,098.62

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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.