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Finding the Fourth Proportional to 85,553.39, 128,012.25 and 53,815.25

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Solution

The fourth proportional to 85,553.39, 128,012.25 and 53,815.25 is: 80,522.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,553.39 : 128,012.25 = 53,815.25 : x
  2. Step 2: Convert to fraction form
    85,553.39/128,012.25 = 53,815.25/x
  3. Step 3: Cross multiply
    85,553.39x = 128,012.25 × 53,815.25
  4. Step 4: Simplify right side
    85,553.39x = 6,889,011,236.81
  5. Step 5: Solve for x
    x = 6,889,011,236.81/85,553.39
  6. Step 6: Final answer
    x = 80,522.95

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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.