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Finding the Fourth Proportional to 85,732.79, 128,678.99 and 43,644.38

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Solution

The fourth proportional to 85,732.79, 128,678.99 and 43,644.38 is: 65,507.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,732.79 : 128,678.99 = 43,644.38 : x
  2. Step 2: Convert to fraction form
    85,732.79/128,678.99 = 43,644.38/x
  3. Step 3: Cross multiply
    85,732.79x = 128,678.99 × 43,644.38
  4. Step 4: Simplify right side
    85,732.79x = 5,616,115,142.64
  5. Step 5: Solve for x
    x = 5,616,115,142.64/85,732.79
  6. Step 6: Final answer
    x = 65,507.20

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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.