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Finding the Fourth Proportional to 128,959.40, 193,439.10 and 81,720.20

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Solution

The fourth proportional to 128,959.40, 193,439.10 and 81,720.20 is: 122,580.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,959.40 : 193,439.10 = 81,720.20 : x
  2. Step 2: Convert to fraction form
    128,959.40/193,439.10 = 81,720.20/x
  3. Step 3: Cross multiply
    128,959.40x = 193,439.10 × 81,720.20
  4. Step 4: Simplify right side
    128,959.40x = 15,807,881,939.82
  5. Step 5: Solve for x
    x = 15,807,881,939.82/128,959.40
  6. Step 6: Final answer
    x = 122,580.30

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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.