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Finding the Fourth Proportional to 85,578.76, 128,431.15 and 40,600.20

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Solution

The fourth proportional to 85,578.76, 128,431.15 and 40,600.20 is: 60,930.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,578.76 : 128,431.15 = 40,600.20 : x
  2. Step 2: Convert to fraction form
    85,578.76/128,431.15 = 40,600.20/x
  3. Step 3: Cross multiply
    85,578.76x = 128,431.15 × 40,600.20
  4. Step 4: Simplify right side
    85,578.76x = 5,214,330,635.17
  5. Step 5: Solve for x
    x = 5,214,330,635.17/85,578.76
  6. Step 6: Final answer
    x = 60,930.19

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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.