Home / 85,822.40-128,762.76-54,195.68

Finding the Fourth Proportional to 85,822.40, 128,762.76 and 54,195.68

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Solution

The fourth proportional to 85,822.40, 128,762.76 and 54,195.68 is: 81,311.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,822.40 : 128,762.76 = 54,195.68 : x
  2. Step 2: Convert to fraction form
    85,822.40/128,762.76 = 54,195.68/x
  3. Step 3: Cross multiply
    85,822.40x = 128,762.76 × 54,195.68
  4. Step 4: Simplify right side
    85,822.40x = 6,978,385,336.88
  5. Step 5: Solve for x
    x = 6,978,385,336.88/85,822.40
  6. Step 6: Final answer
    x = 81,311.93

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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.