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Finding the Fourth Proportional to 85,490.43, 128,242.93 and 22,318.93

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Solution

The fourth proportional to 85,490.43, 128,242.93 and 22,318.93 is: 33,480.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,490.43 : 128,242.93 = 22,318.93 : x
  2. Step 2: Convert to fraction form
    85,490.43/128,242.93 = 22,318.93/x
  3. Step 3: Cross multiply
    85,490.43x = 128,242.93 × 22,318.93
  4. Step 4: Simplify right side
    85,490.43x = 2,862,244,977.66
  5. Step 5: Solve for x
    x = 2,862,244,977.66/85,490.43
  6. Step 6: Final answer
    x = 33,480.30

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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.