Home / 81,311.78-121,967.70-53,603.30

Finding the Fourth Proportional to 81,311.78, 121,967.70 and 53,603.30

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Solution

The fourth proportional to 81,311.78, 121,967.70 and 53,603.30 is: 80,404.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,311.78 : 121,967.70 = 53,603.30 : x
  2. Step 2: Convert to fraction form
    81,311.78/121,967.70 = 53,603.30/x
  3. Step 3: Cross multiply
    81,311.78x = 121,967.70 × 53,603.30
  4. Step 4: Simplify right side
    81,311.78x = 6,537,871,213.41
  5. Step 5: Solve for x
    x = 6,537,871,213.41/81,311.78
  6. Step 6: Final answer
    x = 80,404.97

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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.