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Finding the Fourth Proportional to 40,878.61, 61,289.62 and 20,849.24

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Solution

The fourth proportional to 40,878.61, 61,289.62 and 20,849.24 is: 31,259.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,878.61 : 61,289.62 = 20,849.24 : x
  2. Step 2: Convert to fraction form
    40,878.61/61,289.62 = 20,849.24/x
  3. Step 3: Cross multiply
    40,878.61x = 61,289.62 × 20,849.24
  4. Step 4: Simplify right side
    40,878.61x = 1,277,841,996.89
  5. Step 5: Solve for x
    x = 1,277,841,996.89/40,878.61
  6. Step 6: Final answer
    x = 31,259.43

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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.