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Finding the Fourth Proportional to 85,974.55, 128,980.05 and 25,998.10

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Solution

The fourth proportional to 85,974.55, 128,980.05 and 25,998.10 is: 39,002.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,974.55 : 128,980.05 = 25,998.10 : x
  2. Step 2: Convert to fraction form
    85,974.55/128,980.05 = 25,998.10/x
  3. Step 3: Cross multiply
    85,974.55x = 128,980.05 × 25,998.10
  4. Step 4: Simplify right side
    85,974.55x = 3,353,236,237.91
  5. Step 5: Solve for x
    x = 3,353,236,237.91/85,974.55
  6. Step 6: Final answer
    x = 39,002.66

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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.