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Finding the Fourth Proportional to 85,800.75, 128,720.58 and 30,396.75

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Solution

The fourth proportional to 85,800.75, 128,720.58 and 30,396.75 is: 45,602.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,800.75 : 128,720.58 = 30,396.75 : x
  2. Step 2: Convert to fraction form
    85,800.75/128,720.58 = 30,396.75/x
  3. Step 3: Cross multiply
    85,800.75x = 128,720.58 × 30,396.75
  4. Step 4: Simplify right side
    85,800.75x = 3,912,687,290.12
  5. Step 5: Solve for x
    x = 3,912,687,290.12/85,800.75
  6. Step 6: Final answer
    x = 45,602.02

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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.