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Finding the Fourth Proportional to 55,408.60, 83,112.90 and 51,131.80

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Solution

The fourth proportional to 55,408.60, 83,112.90 and 51,131.80 is: 76,697.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,408.60 : 83,112.90 = 51,131.80 : x
  2. Step 2: Convert to fraction form
    55,408.60/83,112.90 = 51,131.80/x
  3. Step 3: Cross multiply
    55,408.60x = 83,112.90 × 51,131.80
  4. Step 4: Simplify right side
    55,408.60x = 4,249,712,180.22
  5. Step 5: Solve for x
    x = 4,249,712,180.22/55,408.60
  6. Step 6: Final answer
    x = 76,697.70

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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.