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Finding the Fourth Proportional to 85,602.80, 129,045.74 and 79,893.92

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Solution

The fourth proportional to 85,602.80, 129,045.74 and 79,893.92 is: 120,439.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,602.80 : 129,045.74 = 79,893.92 : x
  2. Step 2: Convert to fraction form
    85,602.80/129,045.74 = 79,893.92/x
  3. Step 3: Cross multiply
    85,602.80x = 129,045.74 × 79,893.92
  4. Step 4: Simplify right side
    85,602.80x = 10,309,970,027.90
  5. Step 5: Solve for x
    x = 10,309,970,027.90/85,602.80
  6. Step 6: Final answer
    x = 120,439.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.