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Finding the Fourth Proportional to 93,428.79, 128,874.06 and 66,579.90

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Solution

The fourth proportional to 93,428.79, 128,874.06 and 66,579.90 is: 91,839.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,428.79 : 128,874.06 = 66,579.90 : x
  2. Step 2: Convert to fraction form
    93,428.79/128,874.06 = 66,579.90/x
  3. Step 3: Cross multiply
    93,428.79x = 128,874.06 × 66,579.90
  4. Step 4: Simplify right side
    93,428.79x = 8,580,422,027.39
  5. Step 5: Solve for x
    x = 8,580,422,027.39/93,428.79
  6. Step 6: Final answer
    x = 91,839.16

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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.