Home / 85,721.80-128,669.10-41,384.20

Finding the Fourth Proportional to 85,721.80, 128,669.10 and 41,384.20

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Solution

The fourth proportional to 85,721.80, 128,669.10 and 41,384.20 is: 62,118.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,721.80 : 128,669.10 = 41,384.20 : x
  2. Step 2: Convert to fraction form
    85,721.80/128,669.10 = 41,384.20/x
  3. Step 3: Cross multiply
    85,721.80x = 128,669.10 × 41,384.20
  4. Step 4: Simplify right side
    85,721.80x = 5,324,867,768.22
  5. Step 5: Solve for x
    x = 5,324,867,768.22/85,721.80
  6. Step 6: Final answer
    x = 62,118.01

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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.