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Finding the Fourth Proportional to 72,499.30, 108,662.55 and 30,379.30

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Solution

The fourth proportional to 72,499.30, 108,662.55 and 30,379.30 is: 45,532.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,499.30 : 108,662.55 = 30,379.30 : x
  2. Step 2: Convert to fraction form
    72,499.30/108,662.55 = 30,379.30/x
  3. Step 3: Cross multiply
    72,499.30x = 108,662.55 × 30,379.30
  4. Step 4: Simplify right side
    72,499.30x = 3,301,092,205.22
  5. Step 5: Solve for x
    x = 3,301,092,205.22/72,499.30
  6. Step 6: Final answer
    x = 45,532.75

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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.