Home / 81,439.19-122,128.82-28,117.62

Finding the Fourth Proportional to 81,439.19, 122,128.82 and 28,117.62

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Solution

The fourth proportional to 81,439.19, 122,128.82 and 28,117.62 is: 42,166.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,439.19 : 122,128.82 = 28,117.62 : x
  2. Step 2: Convert to fraction form
    81,439.19/122,128.82 = 28,117.62/x
  3. Step 3: Cross multiply
    81,439.19x = 122,128.82 × 28,117.62
  4. Step 4: Simplify right side
    81,439.19x = 3,433,971,751.81
  5. Step 5: Solve for x
    x = 3,433,971,751.81/81,439.19
  6. Step 6: Final answer
    x = 42,166.09

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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.