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Finding the Fourth Proportional to 128,647.70, 177,533.82 and 78,346.70

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Solution

The fourth proportional to 128,647.70, 177,533.82 and 78,346.70 is: 108,118.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,647.70 : 177,533.82 = 78,346.70 : x
  2. Step 2: Convert to fraction form
    128,647.70/177,533.82 = 78,346.70/x
  3. Step 3: Cross multiply
    128,647.70x = 177,533.82 × 78,346.70
  4. Step 4: Simplify right side
    128,647.70x = 13,909,188,935.39
  5. Step 5: Solve for x
    x = 13,909,188,935.39/128,647.70
  6. Step 6: Final answer
    x = 108,118.44

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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.