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Finding the Fourth Proportional to 72,707.67, 100,386.33 and 55,681.89

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Solution

The fourth proportional to 72,707.67, 100,386.33 and 55,681.89 is: 76,879.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,707.67 : 100,386.33 = 55,681.89 : x
  2. Step 2: Convert to fraction form
    72,707.67/100,386.33 = 55,681.89/x
  3. Step 3: Cross multiply
    72,707.67x = 100,386.33 × 55,681.89
  4. Step 4: Simplify right side
    72,707.67x = 5,589,700,584.56
  5. Step 5: Solve for x
    x = 5,589,700,584.56/72,707.67
  6. Step 6: Final answer
    x = 76,879.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.