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Finding the Fourth Proportional to 85,985.60, 128,900.64 and 30,568.64

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Solution

The fourth proportional to 85,985.60, 128,900.64 and 30,568.64 is: 45,825.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,985.60 : 128,900.64 = 30,568.64 : x
  2. Step 2: Convert to fraction form
    85,985.60/128,900.64 = 30,568.64/x
  3. Step 3: Cross multiply
    85,985.60x = 128,900.64 × 30,568.64
  4. Step 4: Simplify right side
    85,985.60x = 3,940,317,259.93
  5. Step 5: Solve for x
    x = 3,940,317,259.93/85,985.60
  6. Step 6: Final answer
    x = 45,825.32

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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.