Home / 86,378.13-119,085.75-77,520.78

Finding the Fourth Proportional to 86,378.13, 119,085.75 and 77,520.78

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Solution

The fourth proportional to 86,378.13, 119,085.75 and 77,520.78 is: 106,874.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,378.13 : 119,085.75 = 77,520.78 : x
  2. Step 2: Convert to fraction form
    86,378.13/119,085.75 = 77,520.78/x
  3. Step 3: Cross multiply
    86,378.13x = 119,085.75 × 77,520.78
  4. Step 4: Simplify right side
    86,378.13x = 9,231,620,226.89
  5. Step 5: Solve for x
    x = 9,231,620,226.89/86,378.13
  6. Step 6: Final answer
    x = 106,874.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.