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Finding the Fourth Proportional to 72,081.15, 108,121.47 and 19,490.63

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Solution

The fourth proportional to 72,081.15, 108,121.47 and 19,490.63 is: 29,235.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,081.15 : 108,121.47 = 19,490.63 : x
  2. Step 2: Convert to fraction form
    72,081.15/108,121.47 = 19,490.63/x
  3. Step 3: Cross multiply
    72,081.15x = 108,121.47 × 19,490.63
  4. Step 4: Simplify right side
    72,081.15x = 2,107,355,566.83
  5. Step 5: Solve for x
    x = 2,107,355,566.83/72,081.15
  6. Step 6: Final answer
    x = 29,235.88

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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.