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Finding the Fourth Proportional to 72,447.80, 108,720.30 and 42,834.20

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Solution

The fourth proportional to 72,447.80, 108,720.30 and 42,834.20 is: 64,280.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,447.80 : 108,720.30 = 42,834.20 : x
  2. Step 2: Convert to fraction form
    72,447.80/108,720.30 = 42,834.20/x
  3. Step 3: Cross multiply
    72,447.80x = 108,720.30 × 42,834.20
  4. Step 4: Simplify right side
    72,447.80x = 4,656,947,074.26
  5. Step 5: Solve for x
    x = 4,656,947,074.26/72,447.80
  6. Step 6: Final answer
    x = 64,280.03

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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.