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Finding the Fourth Proportional to 155,216.70, 214,216.81 and 86,313.06

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Solution

The fourth proportional to 155,216.70, 214,216.81 and 86,313.06 is: 119,121.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,216.70 : 214,216.81 = 86,313.06 : x
  2. Step 2: Convert to fraction form
    155,216.70/214,216.81 = 86,313.06/x
  3. Step 3: Cross multiply
    155,216.70x = 214,216.81 × 86,313.06
  4. Step 4: Simplify right side
    155,216.70x = 18,489,708,374.54
  5. Step 5: Solve for x
    x = 18,489,708,374.54/155,216.70
  6. Step 6: Final answer
    x = 119,121.90

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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.