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Finding the Fourth Proportional to 85,989.29, 128,802.23 and 54,383.09

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Solution

The fourth proportional to 85,989.29, 128,802.23 and 54,383.09 is: 81,459.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,989.29 : 128,802.23 = 54,383.09 : x
  2. Step 2: Convert to fraction form
    85,989.29/128,802.23 = 54,383.09/x
  3. Step 3: Cross multiply
    85,989.29x = 128,802.23 × 54,383.09
  4. Step 4: Simplify right side
    85,989.29x = 7,004,662,994.38
  5. Step 5: Solve for x
    x = 7,004,662,994.38/85,989.29
  6. Step 6: Final answer
    x = 81,459.71

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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.