Home / 128,575.32-177,431.96-71,988.72

Finding the Fourth Proportional to 128,575.32, 177,431.96 and 71,988.72

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Solution

The fourth proportional to 128,575.32, 177,431.96 and 71,988.72 is: 99,343.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,575.32 : 177,431.96 = 71,988.72 : x
  2. Step 2: Convert to fraction form
    128,575.32/177,431.96 = 71,988.72/x
  3. Step 3: Cross multiply
    128,575.32x = 177,431.96 × 71,988.72
  4. Step 4: Simplify right side
    128,575.32x = 12,773,099,687.49
  5. Step 5: Solve for x
    x = 12,773,099,687.49/128,575.32
  6. Step 6: Final answer
    x = 99,343.32

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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.