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Finding the Fourth Proportional to 128,040.95, 191,915.56 and 80,031.64

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Solution

The fourth proportional to 128,040.95, 191,915.56 and 80,031.64 is: 119,956.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,040.95 : 191,915.56 = 80,031.64 : x
  2. Step 2: Convert to fraction form
    128,040.95/191,915.56 = 80,031.64/x
  3. Step 3: Cross multiply
    128,040.95x = 191,915.56 × 80,031.64
  4. Step 4: Simplify right side
    128,040.95x = 15,359,317,008.32
  5. Step 5: Solve for x
    x = 15,359,317,008.32/128,040.95
  6. Step 6: Final answer
    x = 119,956.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.