Home / 128,575.82-177,432.65-71,989.22

Finding the Fourth Proportional to 128,575.82, 177,432.65 and 71,989.22

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Solution

The fourth proportional to 128,575.82, 177,432.65 and 71,989.22 is: 99,344.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,575.82 : 177,432.65 = 71,989.22 : x
  2. Step 2: Convert to fraction form
    128,575.82/177,432.65 = 71,989.22/x
  3. Step 3: Cross multiply
    128,575.82x = 177,432.65 × 71,989.22
  4. Step 4: Simplify right side
    128,575.82x = 12,773,238,076.03
  5. Step 5: Solve for x
    x = 12,773,238,076.03/128,575.82
  6. Step 6: Final answer
    x = 99,344.01

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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.