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Finding the Fourth Proportional to 56,620, 78,135.60 and 31,474.48

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Solution

The fourth proportional to 56,620, 78,135.60 and 31,474.48 is: 43,434.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,620 : 78,135.60 = 31,474.48 : x
  2. Step 2: Convert to fraction form
    56,620/78,135.60 = 31,474.48/x
  3. Step 3: Cross multiply
    56,620x = 78,135.60 × 31,474.48
  4. Step 4: Simplify right side
    56,620x = 2,459,277,379.49
  5. Step 5: Solve for x
    x = 2,459,277,379.49/56,620
  6. Step 6: Final answer
    x = 43,434.78

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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.