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Finding the Fourth Proportional to 85,439.60, 128,159.40 and 81,162.80

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Solution

The fourth proportional to 85,439.60, 128,159.40 and 81,162.80 is: 121,744.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,439.60 : 128,159.40 = 81,162.80 : x
  2. Step 2: Convert to fraction form
    85,439.60/128,159.40 = 81,162.80/x
  3. Step 3: Cross multiply
    85,439.60x = 128,159.40 × 81,162.80
  4. Step 4: Simplify right side
    85,439.60x = 10,401,775,750.32
  5. Step 5: Solve for x
    x = 10,401,775,750.32/85,439.60
  6. Step 6: Final answer
    x = 121,744.20

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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.