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Finding the Fourth Proportional to 85,879.80, 128,819.70 and 76,366.35

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Solution

The fourth proportional to 85,879.80, 128,819.70 and 76,366.35 is: 114,549.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,879.80 : 128,819.70 = 76,366.35 : x
  2. Step 2: Convert to fraction form
    85,879.80/128,819.70 = 76,366.35/x
  3. Step 3: Cross multiply
    85,879.80x = 128,819.70 × 76,366.35
  4. Step 4: Simplify right side
    85,879.80x = 9,837,490,297.10
  5. Step 5: Solve for x
    x = 9,837,490,297.10/85,879.80
  6. Step 6: Final answer
    x = 114,549.53

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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.