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Finding the Fourth Proportional to 216,505.80, 324,809.90 and 68,761.80

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Solution

The fourth proportional to 216,505.80, 324,809.90 and 68,761.80 is: 103,158.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,505.80 : 324,809.90 = 68,761.80 : x
  2. Step 2: Convert to fraction form
    216,505.80/324,809.90 = 68,761.80/x
  3. Step 3: Cross multiply
    216,505.80x = 324,809.90 × 68,761.80
  4. Step 4: Simplify right side
    216,505.80x = 22,334,513,381.82
  5. Step 5: Solve for x
    x = 22,334,513,381.82/216,505.80
  6. Step 6: Final answer
    x = 103,158.96

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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.