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Finding the Fourth Proportional to 85,423.60, 128,135.40 and 81,341.20

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Solution

The fourth proportional to 85,423.60, 128,135.40 and 81,341.20 is: 122,011.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,423.60 : 128,135.40 = 81,341.20 : x
  2. Step 2: Convert to fraction form
    85,423.60/128,135.40 = 81,341.20/x
  3. Step 3: Cross multiply
    85,423.60x = 128,135.40 × 81,341.20
  4. Step 4: Simplify right side
    85,423.60x = 10,422,687,198.48
  5. Step 5: Solve for x
    x = 10,422,687,198.48/85,423.60
  6. Step 6: Final answer
    x = 122,011.80

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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.