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Finding the Fourth Proportional to 72,707.51, 109,061.11 and 20,116.84

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Solution

The fourth proportional to 72,707.51, 109,061.11 and 20,116.84 is: 30,175.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,707.51 : 109,061.11 = 20,116.84 : x
  2. Step 2: Convert to fraction form
    72,707.51/109,061.11 = 20,116.84/x
  3. Step 3: Cross multiply
    72,707.51x = 109,061.11 × 20,116.84
  4. Step 4: Simplify right side
    72,707.51x = 2,193,964,900.09
  5. Step 5: Solve for x
    x = 2,193,964,900.09/72,707.51
  6. Step 6: Final answer
    x = 30,175.22

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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.