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Finding the Fourth Proportional to 85,900.28, 128,744.68 and 40,945.28

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Solution

The fourth proportional to 85,900.28, 128,744.68 and 40,945.28 is: 61,367.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,900.28 : 128,744.68 = 40,945.28 : x
  2. Step 2: Convert to fraction form
    85,900.28/128,744.68 = 40,945.28/x
  3. Step 3: Cross multiply
    85,900.28x = 128,744.68 × 40,945.28
  4. Step 4: Simplify right side
    85,900.28x = 5,271,486,971.11
  5. Step 5: Solve for x
    x = 5,271,486,971.11/85,900.28
  6. Step 6: Final answer
    x = 61,367.52

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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.