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Finding the Fourth Proportional to 85,410.40, 128,134.80 and 26,248.80

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Solution

The fourth proportional to 85,410.40, 128,134.80 and 26,248.80 is: 39,379.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,410.40 : 128,134.80 = 26,248.80 : x
  2. Step 2: Convert to fraction form
    85,410.40/128,134.80 = 26,248.80/x
  3. Step 3: Cross multiply
    85,410.40x = 128,134.80 × 26,248.80
  4. Step 4: Simplify right side
    85,410.40x = 3,363,384,738.24
  5. Step 5: Solve for x
    x = 3,363,384,738.24/85,410.40
  6. Step 6: Final answer
    x = 39,379.10

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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.