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Finding the Fourth Proportional to 85,654.02, 128,480.31 and 66,949.79

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Solution

The fourth proportional to 85,654.02, 128,480.31 and 66,949.79 is: 100,424.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,654.02 : 128,480.31 = 66,949.79 : x
  2. Step 2: Convert to fraction form
    85,654.02/128,480.31 = 66,949.79/x
  3. Step 3: Cross multiply
    85,654.02x = 128,480.31 × 66,949.79
  4. Step 4: Simplify right side
    85,654.02x = 8,601,729,773.63
  5. Step 5: Solve for x
    x = 8,601,729,773.63/85,654.02
  6. Step 6: Final answer
    x = 100,424.12

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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.