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Finding the Fourth Proportional to 89,940.30, 134,910.45 and 86,100.90

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Solution

The fourth proportional to 89,940.30, 134,910.45 and 86,100.90 is: 129,151.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,940.30 : 134,910.45 = 86,100.90 : x
  2. Step 2: Convert to fraction form
    89,940.30/134,910.45 = 86,100.90/x
  3. Step 3: Cross multiply
    89,940.30x = 134,910.45 × 86,100.90
  4. Step 4: Simplify right side
    89,940.30x = 11,615,911,164.41
  5. Step 5: Solve for x
    x = 11,615,911,164.41/89,940.30
  6. Step 6: Final answer
    x = 129,151.35

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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.