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Finding the Fourth Proportional to 85,573.15, 128,422.80 and 40,594.65

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Solution

The fourth proportional to 85,573.15, 128,422.80 and 40,594.65 is: 60,921.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,573.15 : 128,422.80 = 40,594.65 : x
  2. Step 2: Convert to fraction form
    85,573.15/128,422.80 = 40,594.65/x
  3. Step 3: Cross multiply
    85,573.15x = 128,422.80 × 40,594.65
  4. Step 4: Simplify right side
    85,573.15x = 5,213,278,415.05
  5. Step 5: Solve for x
    x = 5,213,278,415.05/85,573.15
  6. Step 6: Final answer
    x = 60,921.89

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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.