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Finding the Fourth Proportional to 89,815.80, 134,493.30 and 85,668.60

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Solution

The fourth proportional to 89,815.80, 134,493.30 and 85,668.60 is: 128,283.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,815.80 : 134,493.30 = 85,668.60 : x
  2. Step 2: Convert to fraction form
    89,815.80/134,493.30 = 85,668.60/x
  3. Step 3: Cross multiply
    89,815.80x = 134,493.30 × 85,668.60
  4. Step 4: Simplify right side
    89,815.80x = 11,521,852,720.38
  5. Step 5: Solve for x
    x = 11,521,852,720.38/89,815.80
  6. Step 6: Final answer
    x = 128,283.14

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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.