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Finding the Fourth Proportional to 76,977.80, 115,466.70 and 61,425.80

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Solution

The fourth proportional to 76,977.80, 115,466.70 and 61,425.80 is: 92,138.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,977.80 : 115,466.70 = 61,425.80 : x
  2. Step 2: Convert to fraction form
    76,977.80/115,466.70 = 61,425.80/x
  3. Step 3: Cross multiply
    76,977.80x = 115,466.70 × 61,425.80
  4. Step 4: Simplify right side
    76,977.80x = 7,092,634,420.86
  5. Step 5: Solve for x
    x = 7,092,634,420.86/76,977.80
  6. Step 6: Final answer
    x = 92,138.70

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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.