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Finding the Fourth Proportional to 120,909.36, 166,807.08 and 69,912.72

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Solution

The fourth proportional to 120,909.36, 166,807.08 and 69,912.72 is: 96,451.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,909.36 : 166,807.08 = 69,912.72 : x
  2. Step 2: Convert to fraction form
    120,909.36/166,807.08 = 69,912.72/x
  3. Step 3: Cross multiply
    120,909.36x = 166,807.08 × 69,912.72
  4. Step 4: Simplify right side
    120,909.36x = 11,661,936,678.06
  5. Step 5: Solve for x
    x = 11,661,936,678.06/120,909.36
  6. Step 6: Final answer
    x = 96,451.89

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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.