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Finding the Fourth Proportional to 85,972.80, 128,920.80 and 33,364.80

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Solution

The fourth proportional to 85,972.80, 128,920.80 and 33,364.80 is: 50,032.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,972.80 : 128,920.80 = 33,364.80 : x
  2. Step 2: Convert to fraction form
    85,972.80/128,920.80 = 33,364.80/x
  3. Step 3: Cross multiply
    85,972.80x = 128,920.80 × 33,364.80
  4. Step 4: Simplify right side
    85,972.80x = 4,301,416,707.84
  5. Step 5: Solve for x
    x = 4,301,416,707.84/85,972.80
  6. Step 6: Final answer
    x = 50,032.30

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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.