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Finding the Fourth Proportional to 89,907.40, 134,630.70 and 66,406.60

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Solution

The fourth proportional to 89,907.40, 134,630.70 and 66,406.60 is: 99,439.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,907.40 : 134,630.70 = 66,406.60 : x
  2. Step 2: Convert to fraction form
    89,907.40/134,630.70 = 66,406.60/x
  3. Step 3: Cross multiply
    89,907.40x = 134,630.70 × 66,406.60
  4. Step 4: Simplify right side
    89,907.40x = 8,940,367,042.62
  5. Step 5: Solve for x
    x = 8,940,367,042.62/89,907.40
  6. Step 6: Final answer
    x = 99,439.72

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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.