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Finding the Fourth Proportional to 72,656.19, 108,990.54 and 20,065.68

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Solution

The fourth proportional to 72,656.19, 108,990.54 and 20,065.68 is: 30,100.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,656.19 : 108,990.54 = 20,065.68 : x
  2. Step 2: Convert to fraction form
    72,656.19/108,990.54 = 20,065.68/x
  3. Step 3: Cross multiply
    72,656.19x = 108,990.54 × 20,065.68
  4. Step 4: Simplify right side
    72,656.19x = 2,186,969,298.67
  5. Step 5: Solve for x
    x = 2,186,969,298.67/72,656.19
  6. Step 6: Final answer
    x = 30,100.25

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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.