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Finding the Fourth Proportional to 120,612.69, 166,455.72 and 66,915

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Solution

The fourth proportional to 120,612.69, 166,455.72 and 66,915 is: 92,348.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,612.69 : 166,455.72 = 66,915 : x
  2. Step 2: Convert to fraction form
    120,612.69/166,455.72 = 66,915/x
  3. Step 3: Cross multiply
    120,612.69x = 166,455.72 × 66,915
  4. Step 4: Simplify right side
    120,612.69x = 11,138,384,503.80
  5. Step 5: Solve for x
    x = 11,138,384,503.80/120,612.69
  6. Step 6: Final answer
    x = 92,348.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.