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Finding the Fourth Proportional to 128,507.26, 177,333.96 and 71,142.52

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Solution

The fourth proportional to 128,507.26, 177,333.96 and 71,142.52 is: 98,173.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,507.26 : 177,333.96 = 71,142.52 : x
  2. Step 2: Convert to fraction form
    128,507.26/177,333.96 = 71,142.52/x
  3. Step 3: Cross multiply
    128,507.26x = 177,333.96 × 71,142.52
  4. Step 4: Simplify right side
    128,507.26x = 12,615,984,795.98
  5. Step 5: Solve for x
    x = 12,615,984,795.98/128,507.26
  6. Step 6: Final answer
    x = 98,173.32

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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.