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Finding the Fourth Proportional to 85,965.20, 128,947.80 and 80,060.30

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Solution

The fourth proportional to 85,965.20, 128,947.80 and 80,060.30 is: 120,090.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,965.20 : 128,947.80 = 80,060.30 : x
  2. Step 2: Convert to fraction form
    85,965.20/128,947.80 = 80,060.30/x
  3. Step 3: Cross multiply
    85,965.20x = 128,947.80 × 80,060.30
  4. Step 4: Simplify right side
    85,965.20x = 10,323,599,552.34
  5. Step 5: Solve for x
    x = 10,323,599,552.34/85,965.20
  6. Step 6: Final answer
    x = 120,090.45

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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.