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Finding the Fourth Proportional to 85,998.30, 128,742.30 and 63,909.60

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Solution

The fourth proportional to 85,998.30, 128,742.30 and 63,909.60 is: 95,674.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,998.30 : 128,742.30 = 63,909.60 : x
  2. Step 2: Convert to fraction form
    85,998.30/128,742.30 = 63,909.60/x
  3. Step 3: Cross multiply
    85,998.30x = 128,742.30 × 63,909.60
  4. Step 4: Simplify right side
    85,998.30x = 8,227,868,896.08
  5. Step 5: Solve for x
    x = 8,227,868,896.08/85,998.30
  6. Step 6: Final answer
    x = 95,674.79

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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.