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Finding the Fourth Proportional to 85,311.92, 128,045.03 and 43,221.08

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Solution

The fourth proportional to 85,311.92, 128,045.03 and 43,221.08 is: 64,870.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,311.92 : 128,045.03 = 43,221.08 : x
  2. Step 2: Convert to fraction form
    85,311.92/128,045.03 = 43,221.08/x
  3. Step 3: Cross multiply
    85,311.92x = 128,045.03 × 43,221.08
  4. Step 4: Simplify right side
    85,311.92x = 5,534,243,628.90
  5. Step 5: Solve for x
    x = 5,534,243,628.90/85,311.92
  6. Step 6: Final answer
    x = 64,870.70

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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.