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Finding the Fourth Proportional to 85,534.80, 128,302.20 and 69,982.80

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Solution

The fourth proportional to 85,534.80, 128,302.20 and 69,982.80 is: 104,974.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,534.80 : 128,302.20 = 69,982.80 : x
  2. Step 2: Convert to fraction form
    85,534.80/128,302.20 = 69,982.80/x
  3. Step 3: Cross multiply
    85,534.80x = 128,302.20 × 69,982.80
  4. Step 4: Simplify right side
    85,534.80x = 8,978,947,202.16
  5. Step 5: Solve for x
    x = 8,978,947,202.16/85,534.80
  6. Step 6: Final answer
    x = 104,974.20

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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.