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Finding the Fourth Proportional to 85,842.20, 128,504.10 and 75,474.20

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Solution

The fourth proportional to 85,842.20, 128,504.10 and 75,474.20 is: 112,983.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,842.20 : 128,504.10 = 75,474.20 : x
  2. Step 2: Convert to fraction form
    85,842.20/128,504.10 = 75,474.20/x
  3. Step 3: Cross multiply
    85,842.20x = 128,504.10 × 75,474.20
  4. Step 4: Simplify right side
    85,842.20x = 9,698,744,144.22
  5. Step 5: Solve for x
    x = 9,698,744,144.22/85,842.20
  6. Step 6: Final answer
    x = 112,983.41

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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.