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Finding the Fourth Proportional to 85,403.37, 128,182.80 and 45,455.89

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Solution

The fourth proportional to 85,403.37, 128,182.80 and 45,455.89 is: 68,225.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,403.37 : 128,182.80 = 45,455.89 : x
  2. Step 2: Convert to fraction form
    85,403.37/128,182.80 = 45,455.89/x
  3. Step 3: Cross multiply
    85,403.37x = 128,182.80 × 45,455.89
  4. Step 4: Simplify right side
    85,403.37x = 5,826,663,324.02
  5. Step 5: Solve for x
    x = 5,826,663,324.02/85,403.37
  6. Step 6: Final answer
    x = 68,225.21

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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.