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Finding the Fourth Proportional to 85,905.40, 128,639.40 and 81,968.80

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Solution

The fourth proportional to 85,905.40, 128,639.40 and 81,968.80 is: 122,744.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,905.40 : 128,639.40 = 81,968.80 : x
  2. Step 2: Convert to fraction form
    85,905.40/128,639.40 = 81,968.80/x
  3. Step 3: Cross multiply
    85,905.40x = 128,639.40 × 81,968.80
  4. Step 4: Simplify right side
    85,905.40x = 10,544,417,250.72
  5. Step 5: Solve for x
    x = 10,544,417,250.72/85,905.40
  6. Step 6: Final answer
    x = 122,744.52

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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.