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Finding the Fourth Proportional to 72,379.10, 108,565.16 and 19,788.70

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Solution

The fourth proportional to 72,379.10, 108,565.16 and 19,788.70 is: 29,682.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,379.10 : 108,565.16 = 19,788.70 : x
  2. Step 2: Convert to fraction form
    72,379.10/108,565.16 = 19,788.70/x
  3. Step 3: Cross multiply
    72,379.10x = 108,565.16 × 19,788.70
  4. Step 4: Simplify right side
    72,379.10x = 2,148,363,381.69
  5. Step 5: Solve for x
    x = 2,148,363,381.69/72,379.10
  6. Step 6: Final answer
    x = 29,682.10

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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.