Home / 128,528.72-177,368.40-71,940.56

Finding the Fourth Proportional to 128,528.72, 177,368.40 and 71,940.56

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Solution

The fourth proportional to 128,528.72, 177,368.40 and 71,940.56 is: 99,277.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,528.72 : 177,368.40 = 71,940.56 : x
  2. Step 2: Convert to fraction form
    128,528.72/177,368.40 = 71,940.56/x
  3. Step 3: Cross multiply
    128,528.72x = 177,368.40 × 71,940.56
  4. Step 4: Simplify right side
    128,528.72x = 12,759,982,022.30
  5. Step 5: Solve for x
    x = 12,759,982,022.30/128,528.72
  6. Step 6: Final answer
    x = 99,277.28

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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.