Home / 81,778.10-122,667.15-81,259.70

Finding the Fourth Proportional to 81,778.10, 122,667.15 and 81,259.70

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Solution

The fourth proportional to 81,778.10, 122,667.15 and 81,259.70 is: 121,889.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,778.10 : 122,667.15 = 81,259.70 : x
  2. Step 2: Convert to fraction form
    81,778.10/122,667.15 = 81,259.70/x
  3. Step 3: Cross multiply
    81,778.10x = 122,667.15 × 81,259.70
  4. Step 4: Simplify right side
    81,778.10x = 9,967,895,808.86
  5. Step 5: Solve for x
    x = 9,967,895,808.86/81,778.10
  6. Step 6: Final answer
    x = 121,889.55

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1.5x scale

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.