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Finding the Fourth Proportional to 85,390.30, 128,121.90 and 40,994.20

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Solution

The fourth proportional to 85,390.30, 128,121.90 and 40,994.20 is: 61,508.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,390.30 : 128,121.90 = 40,994.20 : x
  2. Step 2: Convert to fraction form
    85,390.30/128,121.90 = 40,994.20/x
  3. Step 3: Cross multiply
    85,390.30x = 128,121.90 × 40,994.20
  4. Step 4: Simplify right side
    85,390.30x = 5,252,254,792.98
  5. Step 5: Solve for x
    x = 5,252,254,792.98/85,390.30
  6. Step 6: Final answer
    x = 61,508.80

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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.