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Finding the Fourth Proportional to 72,748.68, 109,124.73 and 20,158.62

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Solution

The fourth proportional to 72,748.68, 109,124.73 and 20,158.62 is: 30,238.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,748.68 : 109,124.73 = 20,158.62 : x
  2. Step 2: Convert to fraction form
    72,748.68/109,124.73 = 20,158.62/x
  3. Step 3: Cross multiply
    72,748.68x = 109,124.73 × 20,158.62
  4. Step 4: Simplify right side
    72,748.68x = 2,199,803,964.67
  5. Step 5: Solve for x
    x = 2,199,803,964.67/72,748.68
  6. Step 6: Final answer
    x = 30,238.40

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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.