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Finding the Fourth Proportional to 85,668.48, 128,579.52 and 71,715.84

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Solution

The fourth proportional to 85,668.48, 128,579.52 and 71,715.84 is: 107,638.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,668.48 : 128,579.52 = 71,715.84 : x
  2. Step 2: Convert to fraction form
    85,668.48/128,579.52 = 71,715.84/x
  3. Step 3: Cross multiply
    85,668.48x = 128,579.52 × 71,715.84
  4. Step 4: Simplify right side
    85,668.48x = 9,221,188,283.60
  5. Step 5: Solve for x
    x = 9,221,188,283.60/85,668.48
  6. Step 6: Final answer
    x = 107,638.05

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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.