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Finding the Fourth Proportional to 85,819.10, 128,728.65 and 72,859.10

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Solution

The fourth proportional to 85,819.10, 128,728.65 and 72,859.10 is: 109,288.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,819.10 : 128,728.65 = 72,859.10 : x
  2. Step 2: Convert to fraction form
    85,819.10/128,728.65 = 72,859.10/x
  3. Step 3: Cross multiply
    85,819.10x = 128,728.65 × 72,859.10
  4. Step 4: Simplify right side
    85,819.10x = 9,379,053,583.22
  5. Step 5: Solve for x
    x = 9,379,053,583.22/85,819.10
  6. Step 6: Final answer
    x = 109,288.65

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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.