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Finding the Fourth Proportional to 85,505.40, 128,411.70 and 82,740.60

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Solution

The fourth proportional to 85,505.40, 128,411.70 and 82,740.60 is: 124,259.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,505.40 : 128,411.70 = 82,740.60 : x
  2. Step 2: Convert to fraction form
    85,505.40/128,411.70 = 82,740.60/x
  3. Step 3: Cross multiply
    85,505.40x = 128,411.70 × 82,740.60
  4. Step 4: Simplify right side
    85,505.40x = 10,624,861,105.02
  5. Step 5: Solve for x
    x = 10,624,861,105.02/85,505.40
  6. Step 6: Final answer
    x = 124,259.53

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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.