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Finding the Fourth Proportional to 72,370.47, 108,558.74 and 19,779.80

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Solution

The fourth proportional to 72,370.47, 108,558.74 and 19,779.80 is: 29,670.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,370.47 : 108,558.74 = 19,779.80 : x
  2. Step 2: Convert to fraction form
    72,370.47/108,558.74 = 19,779.80/x
  3. Step 3: Cross multiply
    72,370.47x = 108,558.74 × 19,779.80
  4. Step 4: Simplify right side
    72,370.47x = 2,147,270,165.45
  5. Step 5: Solve for x
    x = 2,147,270,165.45/72,370.47
  6. Step 6: Final answer
    x = 29,670.53

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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.