Home / 86,069.13-128,238.63-81,234.68

Finding the Fourth Proportional to 86,069.13, 128,238.63 and 81,234.68

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Solution

The fourth proportional to 86,069.13, 128,238.63 and 81,234.68 is: 121,035.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,069.13 : 128,238.63 = 81,234.68 : x
  2. Step 2: Convert to fraction form
    86,069.13/128,238.63 = 81,234.68/x
  3. Step 3: Cross multiply
    86,069.13x = 128,238.63 × 81,234.68
  4. Step 4: Simplify right side
    86,069.13x = 10,417,423,430.50
  5. Step 5: Solve for x
    x = 10,417,423,430.50/86,069.13
  6. Step 6: Final answer
    x = 121,035.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.