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Finding the Fourth Proportional to 81,353.99, 122,117.25 and 72,054.38

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Solution

The fourth proportional to 81,353.99, 122,117.25 and 72,054.38 is: 108,157.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,353.99 : 122,117.25 = 72,054.38 : x
  2. Step 2: Convert to fraction form
    81,353.99/122,117.25 = 72,054.38/x
  3. Step 3: Cross multiply
    81,353.99x = 122,117.25 × 72,054.38
  4. Step 4: Simplify right side
    81,353.99x = 8,799,082,125.47
  5. Step 5: Solve for x
    x = 8,799,082,125.47/81,353.99
  6. Step 6: Final answer
    x = 108,157.97

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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.