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Finding the Fourth Proportional to 128,503.40, 177,385.80 and 87,119.96

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Solution

The fourth proportional to 128,503.40, 177,385.80 and 87,119.96 is: 120,260.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,503.40 : 177,385.80 = 87,119.96 : x
  2. Step 2: Convert to fraction form
    128,503.40/177,385.80 = 87,119.96/x
  3. Step 3: Cross multiply
    128,503.40x = 177,385.80 × 87,119.96
  4. Step 4: Simplify right side
    128,503.40x = 15,453,843,800.57
  5. Step 5: Solve for x
    x = 15,453,843,800.57/128,503.40
  6. Step 6: Final answer
    x = 120,260.19

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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.