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Finding the Fourth Proportional to 216,561.78, 324,624.56 and 90,271.94

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Solution

The fourth proportional to 216,561.78, 324,624.56 and 90,271.94 is: 135,316.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,561.78 : 324,624.56 = 90,271.94 : x
  2. Step 2: Convert to fraction form
    216,561.78/324,624.56 = 90,271.94/x
  3. Step 3: Cross multiply
    216,561.78x = 324,624.56 × 90,271.94
  4. Step 4: Simplify right side
    216,561.78x = 29,304,486,728.36
  5. Step 5: Solve for x
    x = 29,304,486,728.36/216,561.78
  6. Step 6: Final answer
    x = 135,316.98

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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.