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Finding the Fourth Proportional to 85,995.60, 128,950.20 and 39,195.60

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Solution

The fourth proportional to 85,995.60, 128,950.20 and 39,195.60 is: 58,773.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,995.60 : 128,950.20 = 39,195.60 : x
  2. Step 2: Convert to fraction form
    85,995.60/128,950.20 = 39,195.60/x
  3. Step 3: Cross multiply
    85,995.60x = 128,950.20 × 39,195.60
  4. Step 4: Simplify right side
    85,995.60x = 5,054,280,459.12
  5. Step 5: Solve for x
    x = 5,054,280,459.12/85,995.60
  6. Step 6: Final answer
    x = 58,773.71

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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.