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Finding the Fourth Proportional to 55,390, 76,438.44 and 30,239.68

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Solution

The fourth proportional to 55,390, 76,438.44 and 30,239.68 is: 41,730.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,390 : 76,438.44 = 30,239.68 : x
  2. Step 2: Convert to fraction form
    55,390/76,438.44 = 30,239.68/x
  3. Step 3: Cross multiply
    55,390x = 76,438.44 × 30,239.68
  4. Step 4: Simplify right side
    55,390x = 2,311,473,965.30
  5. Step 5: Solve for x
    x = 2,311,473,965.30/55,390
  6. Step 6: Final answer
    x = 41,730.89

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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.