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Finding the Fourth Proportional to 128,285.65, 177,028.97 and 70,921.32

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Solution

The fourth proportional to 128,285.65, 177,028.97 and 70,921.32 is: 97,868.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,285.65 : 177,028.97 = 70,921.32 : x
  2. Step 2: Convert to fraction form
    128,285.65/177,028.97 = 70,921.32/x
  3. Step 3: Cross multiply
    128,285.65x = 177,028.97 × 70,921.32
  4. Step 4: Simplify right side
    128,285.65x = 12,555,128,230.64
  5. Step 5: Solve for x
    x = 12,555,128,230.64/128,285.65
  6. Step 6: Final answer
    x = 97,868.53

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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.