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Finding the Fourth Proportional to 128,439.40, 192,659.10 and 112,887.40

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Solution

The fourth proportional to 128,439.40, 192,659.10 and 112,887.40 is: 169,331.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,439.40 : 192,659.10 = 112,887.40 : x
  2. Step 2: Convert to fraction form
    128,439.40/192,659.10 = 112,887.40/x
  3. Step 3: Cross multiply
    128,439.40x = 192,659.10 × 112,887.40
  4. Step 4: Simplify right side
    128,439.40x = 21,748,784,885.34
  5. Step 5: Solve for x
    x = 21,748,784,885.34/128,439.40
  6. Step 6: Final answer
    x = 169,331.10

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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.