Home / 81,381.40-122,072.10-51,820.45

Finding the Fourth Proportional to 81,381.40, 122,072.10 and 51,820.45

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Solution

The fourth proportional to 81,381.40, 122,072.10 and 51,820.45 is: 77,730.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,381.40 : 122,072.10 = 51,820.45 : x
  2. Step 2: Convert to fraction form
    81,381.40/122,072.10 = 51,820.45/x
  3. Step 3: Cross multiply
    81,381.40x = 122,072.10 × 51,820.45
  4. Step 4: Simplify right side
    81,381.40x = 6,325,831,154.45
  5. Step 5: Solve for x
    x = 6,325,831,154.45/81,381.40
  6. Step 6: Final answer
    x = 77,730.68

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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.