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Finding the Fourth Proportional to 216,415.55, 324,658.20 and 66,655.79

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Solution

The fourth proportional to 216,415.55, 324,658.20 and 66,655.79 is: 99,994.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,415.55 : 324,658.20 = 66,655.79 : x
  2. Step 2: Convert to fraction form
    216,415.55/324,658.20 = 66,655.79/x
  3. Step 3: Cross multiply
    216,415.55x = 324,658.20 × 66,655.79
  4. Step 4: Simplify right side
    216,415.55x = 21,640,348,800.98
  5. Step 5: Solve for x
    x = 21,640,348,800.98/216,415.55
  6. Step 6: Final answer
    x = 99,994.43

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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.