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Finding the Fourth Proportional to 85,415.10, 128,122.65 and 80,822.40

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Solution

The fourth proportional to 85,415.10, 128,122.65 and 80,822.40 is: 121,233.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,415.10 : 128,122.65 = 80,822.40 : x
  2. Step 2: Convert to fraction form
    85,415.10/128,122.65 = 80,822.40/x
  3. Step 3: Cross multiply
    85,415.10x = 128,122.65 × 80,822.40
  4. Step 4: Simplify right side
    85,415.10x = 10,355,180,067.36
  5. Step 5: Solve for x
    x = 10,355,180,067.36/85,415.10
  6. Step 6: Final answer
    x = 121,233.60

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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.