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Finding the Fourth Proportional to 85,883.60, 128,825.40 and 50,805.20

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Solution

The fourth proportional to 85,883.60, 128,825.40 and 50,805.20 is: 76,207.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,883.60 : 128,825.40 = 50,805.20 : x
  2. Step 2: Convert to fraction form
    85,883.60/128,825.40 = 50,805.20/x
  3. Step 3: Cross multiply
    85,883.60x = 128,825.40 × 50,805.20
  4. Step 4: Simplify right side
    85,883.60x = 6,545,000,212.08
  5. Step 5: Solve for x
    x = 6,545,000,212.08/85,883.60
  6. Step 6: Final answer
    x = 76,207.80

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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.