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Finding the Fourth Proportional to 128,783.40, 193,175.10 and 109,343.40

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Solution

The fourth proportional to 128,783.40, 193,175.10 and 109,343.40 is: 164,015.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,783.40 : 193,175.10 = 109,343.40 : x
  2. Step 2: Convert to fraction form
    128,783.40/193,175.10 = 109,343.40/x
  3. Step 3: Cross multiply
    128,783.40x = 193,175.10 × 109,343.40
  4. Step 4: Simplify right side
    128,783.40x = 21,122,422,229.34
  5. Step 5: Solve for x
    x = 21,122,422,229.34/128,783.40
  6. Step 6: Final answer
    x = 164,015.10

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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.