Home / 82,021.74-122,988.86-42,480.78

Finding the Fourth Proportional to 82,021.74, 122,988.86 and 42,480.78

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Solution

The fourth proportional to 82,021.74, 122,988.86 and 42,480.78 is: 63,698.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,021.74 : 122,988.86 = 42,480.78 : x
  2. Step 2: Convert to fraction form
    82,021.74/122,988.86 = 42,480.78/x
  3. Step 3: Cross multiply
    82,021.74x = 122,988.86 × 42,480.78
  4. Step 4: Simplify right side
    82,021.74x = 5,224,662,704.11
  5. Step 5: Solve for x
    x = 5,224,662,704.11/82,021.74
  6. Step 6: Final answer
    x = 63,698.51

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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.