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Finding the Fourth Proportional to 93,402.09, 128,928.13 and 55,161.79

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Solution

The fourth proportional to 93,402.09, 128,928.13 and 55,161.79 is: 76,142.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,402.09 : 128,928.13 = 55,161.79 : x
  2. Step 2: Convert to fraction form
    93,402.09/128,928.13 = 55,161.79/x
  3. Step 3: Cross multiply
    93,402.09x = 128,928.13 × 55,161.79
  4. Step 4: Simplify right side
    93,402.09x = 7,111,906,432.15
  5. Step 5: Solve for x
    x = 7,111,906,432.15/93,402.09
  6. Step 6: Final answer
    x = 76,142.90

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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.