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Finding the Fourth Proportional to 85,572.90, 128,422.42 and 40,594.40

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Solution

The fourth proportional to 85,572.90, 128,422.42 and 40,594.40 is: 60,921.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,572.90 : 128,422.42 = 40,594.40 : x
  2. Step 2: Convert to fraction form
    85,572.90/128,422.42 = 40,594.40/x
  3. Step 3: Cross multiply
    85,572.90x = 128,422.42 × 40,594.40
  4. Step 4: Simplify right side
    85,572.90x = 5,213,231,086.45
  5. Step 5: Solve for x
    x = 5,213,231,086.45/85,572.90
  6. Step 6: Final answer
    x = 60,921.52

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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.