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Finding the Fourth Proportional to 93,459.10, 128,971.90 and 53,172

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Solution

The fourth proportional to 93,459.10, 128,971.90 and 53,172 is: 73,376.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,459.10 : 128,971.90 = 53,172 : x
  2. Step 2: Convert to fraction form
    93,459.10/128,971.90 = 53,172/x
  3. Step 3: Cross multiply
    93,459.10x = 128,971.90 × 53,172
  4. Step 4: Simplify right side
    93,459.10x = 6,857,693,866.80
  5. Step 5: Solve for x
    x = 6,857,693,866.80/93,459.10
  6. Step 6: Final answer
    x = 73,376.42

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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.