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Finding the Fourth Proportional to 85,485.85, 128,228.78 and 81,403.45

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Solution

The fourth proportional to 85,485.85, 128,228.78 and 81,403.45 is: 122,105.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,485.85 : 128,228.78 = 81,403.45 : x
  2. Step 2: Convert to fraction form
    85,485.85/128,228.78 = 81,403.45/x
  3. Step 3: Cross multiply
    85,485.85x = 128,228.78 × 81,403.45
  4. Step 4: Simplify right side
    85,485.85x = 10,438,264,674.27
  5. Step 5: Solve for x
    x = 10,438,264,674.27/85,485.85
  6. Step 6: Final answer
    x = 122,105.18

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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.